Okay. I am in possession of a 2.5 GB base directory... With 2.48 of that being maps.
(Approx 500 map)
I will be creating a torrent for these soon. I'm going to try and expand my collection a bit more, but I doubt there is much else.
If you want your own map added, please PM me with a link to download.
PS: If anyone has a webserver that they don't mind having the bandwidth sucked out of, PM me

(I may split them into parts and rapidshit them. Most likely not.)
PPS: There are only about 300-400 different maps, about 100-200 make up different versions of the same map.
Thankyou Spectre, for that info:
MAPLIST:
a2b1.pk3
a2b1_001.pk3
Abbok.pk3
ambush1.pk3
Arena.pk3
arena_a4.pk3
arena_a5.pk3
Ascari-1.1.0.pk3
ATCC.pk3
basecano_b3.pk3
battlesim.pk3
bresalpha1.pk3
BumperGranger_b1.pk3
CargoPort-102.pk3
CargoPort-106.pk3
circletrain.pk3
cube_b2.pk3
Dangercity.pk3
dark.pk3
DayAfter.pk3
diantus.pk3
dunjeon.pk3
dunno.b1.pk3
Eccentrix-b1.pk3
far_beyond.pk3
fsn_tricks.pk3
FunTimez.pk3
g3tremb2.pk3
giantgensurf.pk3
GrangerRink_b2.pk3
hamunaptra.pk3
HandsOfGod.pk3
highrise-b5.pk3
highrise-b6.pk3
house.pk3
ICU.pk3
korcastle_b1.pk3
Lost_r1.pk3
Lostb4.pk3
lowrise3_ex-rc1.pk3
map-!nversion-a7.pk3
map-!nversion-b1.pk3
map_aegis_station.pk3
map_aegis_station_b1.pk3
map_powergrid_b25.pk3
map-1984b2.pk3
map-1984b3.pk3
map-1984b4.pk3
map-Able.pk3
map-abyss_a1.pk3
map-abyss_a2.pk3
map-abyss_a3.pk3
map-abyss_a4.pk3
map-abyss_a5.pk3
map-ADOCa1.pk3
map-aeolos-b2.pk3
map-Alien2.pk3
map-ambush.pk3
map-ancient_b1.pk3
map-ancient_remains-1.0.pk3
map-arachnid2-1.1.0.pk3
map-arena.pk3
map-arena_a4.pk3
map-arkadia.pk3
map-atces-1.1.0.pk3
map-atcs-1.1.0.pk3
map-atcs-2yb.pk3
map-atcs3.pk3
map-atcs4-b4.pk3
map-atcs-onice-b1.pk3
map-atcsunderground.pk3
map-atcs-x.pk3
map-atcs-x-alpha-1.pk3
map-atcs-x-beta-1.pk3
map-atcs-x-beta6.pk3
map-atcszalpha.pk3
map-atcszalpha-b1.pk3
map-atcszalpha-b2.pk3
map-atcszcargo-a1.pk3
map-atds.pk3
map-atds2_b2.pk3
map-atds-b1.pk3
map-atestcs3-4.pk3
map-battlezone_b1.pk3
map-battlezone_b2.pk3
map-battlezone_final.pk3
map-baztek_b2.pk3
map-bedtime.pk3
map-box-a1.pk3
map-box-a2.pk3
map-box-a3.pk3
map-boxfield-b3.pk3
map-boxfield-b4.pk3
map-boxfield-b5.pk3
map-Bunker5634.pk3
map-cage_b1.pk3
map-CampinColumns.pk3
map-cannon_b1.pk3
map-castle-b1.pk3
map-Cerberus.pk3
map-Cerberus_b1.pk3
map-Cerberus_final.pk3
map-Cerberus_rc2.pk3
map-citadel.pk3
map-citadel_beta2.pk3
map-cleanser.pk3
map-cleanserb1.pk3
map-cleanserb2.pk3
map-cleanserb3.pk3
map-coconut.pk3
map-coloric-0.0.1.pk3
map-cruz-b1.pk3
map-cruz-b2.pk3
map-cube-spatial-c.pk3
map-DarkCastle.pk3
map-darkness-1.1.0-BETA1.pk3
map-das_konstrukt-alpha1.pk3
map-deathhall.pk3
map-deathhall-r2.pk3
map-delirium-b1.pk3
map-delirium-b2.pk3
map-derelictb-beta04.pk3
map-DMB01-alpa.1.0.pk3
map-dretchduel_0-1.pk3
map-dretchrange-b2.pk3
map-dretchrange-b4.pk3
map-DretchRugby.pk3
map-dryout_b1.pk3
map-dryout_b1b.pk3
map-dryout_b1c.pk3
map-dryout_b2a.pk3
map-dryout_b3a.pk3
map-dryout_b4a (2).pk3
map-dryout_b4a.pk3
map-dryout_b5a.pk3
map-DSArena.pk3
map-DSArena_a2.pk3
map-Eden-a3.pk3
map-Eden-b3.pk3
map-eggcarton-b1.pk3
map-ethereal.pk3
map-example-a1.pk3
map-example-a2.pk3
map-example-a3.pk3
map-example-a4.pk3
map-example-a5.pk3
map-example-a6.pk3
map-example-b1.pk3
map-example-b2.pk3
map-example-b3.pk3
map-example-b4.pk3
map-example-b5.pk3
map-example-b6.pk3
map-Exploit_b2r.pk3
map-FAIL-b2.pk3
map-fatal_error-0.1.1.pk3
map-FirstContactbeta.pk3
map-FirstContactFinal.pk3
map-flap.pk3
map-Fort4.pk3
map-Fort5.pk3
map-fortress.pk3
map-foto_ita.pk3
map-frax_b2r1.pk3
map-freeport_21_a1.pk3
map-funzone_b1.pk3
map-gamma_core-beta2.pk3
map-gamma_core-beta5.pk3
map-gamma_core-beta6.pk3
map-gamma_core-final.pk3
map-gantry0.1.2.pk3
map-glass1.pk3
map-glass2.pk3
map-glass2_1.pk3
map-gloom_b1.pk3
map-gloom_b2.pk3
map-gloom2beta1.pk3
map-gloom2beta2.pk3
map-gloom3t.pk3
map-goof-a1.pk3
map-goofy.pk3
map-GrangerRink_b2.pk3
map-GrangerRink_b3.pk3
map-grangerrink_b4.pk3
Map-GrangerSpace-a3.pk3
Map-grangerwarz-beta1-1.1.0.pk3
map-grief-beta1.pk3
map-groundsource-a1.pk3
map-groundsource-a2.pk3
map-groundsource-a3.pk3
map-groundsource-a4.pk3
map-groundsource-a5.pk3
map-groundsource-a6.pk3
map-groundsource-b1.pk3
map-groundsource-final.pk3
map-groundsource-v11.pk3
map-ig_chaos.pk3
map-ig_chaos_b1.pk3
map-ig_icetrap_a3.pk3
map-induction_b1.pk3
map-induction_b2.pk3
map-induction_b3.pk3
map-insanity_final-1_1.pk3
map-intent-0.0.2.pk3
map-intent-0.0.3.pk3
map-Jail-House-Rock.pk3
map-JBCA-final.pk3
map-K2o.Pk3
map-Kairorun.pk3
map-kamalkaelA2.pk3
map-karith-1.1.0.pk3
map-killbox-1.1.0.pk3
map-kor-castle-v1.pk3
map-lab_b1.pk3
map-Labyrinth.pk3
map-Labyrinth-Build14.pk3
map-Labyrinth-build18.pk3
map-Labyrinth-build19.pk3
map-Labyrinth-build20.pk3
map-Labyrinth-build21.pk3
map-legocannon.pk3
map-legocannon2.pk3
map-Levelling.pk3
map-linux1.pk3
map-linux4.pk3
map-linux4-1.pk3
map-lite-v1.pk3
map-lite-V3.pk3
map-lockout_b1.pk3
map-loop_b1.pk3
map-Lostb6.pk3
map-lowrise_b2.pk3
map-lowrise1.pk3
map-LSDb3.pk3
map-mancannon_b1.pk3
map-mancannon_b2.pk3
map-mancannon_b3.pk3
map-mancannon_b4.pk3
map-marsbase_b2.pk3
map-mcc.pk3
map-mccfinal.pk3
map-Medusa_CTMb1.pk3
map-meep_b1.pk3
map-meep_b2.pk3
map-meteor.pk3
map-metro-b1.pk3
map-metro-b1-1.pk3
map-metro-b1-2.pk3
map-metro-DA.pk3
map-mg_crate.pk3
map-mg_crate2.pk3
map-mineshaft_a6_7.pk3
map-minetest2.pk3
map-miniatcs.pk3
map-miniatcs2.pk3
map-minicube_p1.pk3
map-Mini-Flora.pk3
map-mission_one_b2.pk3
map-mission_one_b3.pk3
map-mission_one_b4.pk3
map-mission_one_b5.pk3
map-mission_one_b6.pk3
map-mission_one_b7.pk3
map-misty-a1.pk3
map-monka1.pk3
map-nano-alpha1.pk3
map-nano-beta1.pk3
map-nano-beta2.pk3
map-nexus6-1.1.0.pk3
map-niveus-1.1.0.pk3
map-noname.pk3
map-nova6.pk3
map-obj_infested-b2.pk3
map-office-space.pk3
map-omega_b1.pk3
map-openfield-beta2.pk3
map-orion-alpha1.pk3
map-orion-beta1.pk3
map-orion-beta2.pk3
map-outland.pk3
map-OutLand+.pk3
map-outpost_p4_beta3.pk3
map-outpost_p4_beta4.pk3
map-Outpost-Warthog.pk3
map-paint.pk3
map-paint2.pk3
map-paint2.pk3.pk3
map-paint3.pk3
map-paint4.pk3
map-paint5.pk3
map-paint6.pk3
map-paint7.pk3
map-paint8.pk3
map-paint9.pk3
map-paintfactory.pk3
map-peorongate-b3.pk3
map-peorongate-p3.pk3
mapping-competition-2007-mappack.pk3
map-pitfall-beta2.pk3
map-pl0xsyn.pk3
map-Platform_021b3.pk3
map-pmw.pk3
map-procyon.pk3
map-procyon-beta1.pk3
map-procyon-beta2.pk3
map-procyon-preview1.pk3
map-procyon-preview2.pk3
map-procyon-r1.pk3
map-pulse-beta3-1.1.0.pk3
map-pushcannon.pk3
map-pushcannon_b1.pk3
map-pushcannon_b2.pk3
map-pushcannon_b3.pk3
map-pushcannon_b3.d6345c27.pk3
map-pushcannon_b3a.pk3
map-quake1-a1.pk3
map-ramp-a1.pk3
map-redux1.pk3
map-roflcoaster-t2.pk3
map-RoomyA3.pk3
map-rotcannon-b10.pk3
map-rotcannon-b11.pk3
map-rotcannon-b5.pk3
map-rotcannon-garbage-1.pk3
map-sal.pk3
map-sectorb17.pk3
map-sectorb17_beta1.pk3
map-sectorb17_gameplaytest.pk3
map-sectorb17_gameplaytest2.pk3
map-sectorb17_gameplaytest3.pk3
map-sedna-beta1-1.1.0.pk3
map-sedna-beta2-1.1.0.pk3
map-sedna-beta3-1.1.0.pk3
map-sfum.pk3
map-sidewinder_b1.pk3
map-sidewinder-b1-build4.pk3
map-siege-1.1.1.pk3
map-siege-1.1.2.pk3
map-sirius.pk3
map-sirius-alpha1.pk3
map-sirius-beta1.pk3
map-skirmish.pk3
map-skycastle-1.0.pk3
map-slimepunk-b2.pk3
map-snipertime.pk3
map-snowvalley3-b2.pk3
map-sokolov_0.4.pk3
map-sokolov_0.5.pk3
map-sokolov-0.6.pk3
map-sokolov-0.7.1.pk3
map-sokolov-0.7.2.pk3
map-sokolov-1.1.pk3
map-sophcompre1.pk3
map-spacedeath-beta_1.pk3
map-spacetracks_beta1.pk3
map-stamina-1.1.0.pk3
map-stamina-beta2-1.1.0.pk3
map-StarGateCommand-b1.pk3
map-station15-b2.pk3
map-station15-beta1.pk3
map-station15-beta2.pk3
map-station15-beta3.pk3
map-subterranean_0-1.pk3
map-super-s1-lms.pk3
map-super-s1-lms_b3.pk3
map-supersimple_beta1.pk3
map-takana-b1.pk3
map-td_playplaceb1.pk3
map-telebright.pk3
map-temple.pk3
map-temple-0.5.5.pk3
map-thanatos_b2.pk3
map-thanatos_b3.pk3
map-the_two_towers_b1.pk3
map-the_two_towers_b2.pk3
map-the_two_towers_b3.pk3
map-theBunker-1.0.0.pk3
map-TheChurch.pk3
map-thermal.pk3
map-thermal-b1.pk3
map-thermal-b2.pk3
map-ticonderoga_0-1.pk3
map-ticonderoga_0-2.pk3
map-ticonderoga_0-3.pk3
map-ticonderoga_0-4.pk3
map-tiefe_alpha.pk3
map-tk_beta2.pk3
map-tnt.pk3
map-train-a1.pk3
map-traininggrounds_1.pk3
map-Tranc3-Alpha-1.2.pk3
map-transit-1.1.0.pk3
map-treecannon_b1.pk3
map-treecannon_b2.pk3
map-treecannon_b3.pk3
map-treecannon_b4.pk3
map-tremor-1.1.0.pk3
map-tremor-1.1.2.pk3
map-trempoline-x-mas.pk3
map-troyan_gates.pk3
map-tumbo7_0-1.pk3
map-tumbo7_0-2.pk3
map-tunnel_1.0.0.pk3
map-tunnel_2.0.0.pk3
map-uncreation-1.1.0.pk3
map-unnamed.pk3
map-uranium-124.pk3
map-uranium-alpha3.pk3
map-urban-p2.pk3
map-UTCSb2.pk3
map-UTCSfinal.pk3
map-veddak-final.pk3
map-void.pk3
map-void_b3.pk3
map-void_b5.pk3
map-volcano-alpha1-1.1.0.pk3
map-volcano-alpha2-1.1.0.pk3
map-volcano-alpha3-1.1.0.pk3
map-volcano-alpha4-1.1.0.pk3
map-Vulcan-Alpha-1.1.0.pk3
map-watah-b2.pk3
map-watah-b4.pk3
map-watah-b5.pk3
map-wrecktify_b1.pk3
map-wth.pk3
map-Xmas_2007_1.0.pk3
map-xtc.pk3
map-xtce-final.pk3
map-xtremesurf_b2.pk3
map-zz_k2ofakemap.pk3
marsbase.pk3
metro-b1-1_DA1.pk3
metro-b1-1_DA2.pk3
minicube.pk3
mission one b2.pk3
mission.pk3
mod-crazylcannon.pk3
nameless_alpha.pk3
nightfall.pk3
noname-beta1.pk3
Obsession.pk3
outpost_p4.pk3
pitores.pk3
Platform_021.pk3
power-grangers.pk3
project-x7-t6.pk3
Sciardinu_beta2.pk3
ship_b0-2.pk3
shoebox.pk3
slimepunk b2.pk3
Slimepunk-b2.pk3
snowvalley-a1.pk3
Space-Mining-Facility.pk3
starfish-a1.pk3
starfish-a2.pk3
stcs-b1.pk3
stcs-b2.pk3
Storage_beta1.pk3
straftrain1.pk3
T3.pk3
takana.pk3
takana2.pk3
thanatos_b3.pk3
thurze.pk3
trempoline-b3.pk3
trempoline-x-mas.pk3
UnTamed_beta1a.pk3
vms-1.1.0.pk3
void_b4.pk3
wth.pk3
zob.pk3
If it's not on there, Pm me it!