With the new 1.2 boosters giving you an insane heal rate they are like a medistation for aliens. The boosters can be placed to abuse the map geometry so it can even heal aliens from the other side of the map. And as a big plus: you don't have to worry about the booster being destroyed, at least on the other side. Some of these boosters are great to cover both of the exits of human base with only the build points of a single booster.
Some of them have other uses.
Here are some useful boosters from the stock maps:
Arachnid2
Booster is placed near the vent in default alien base...
... and it heals in the big hall.
Booster is placed high up near the entrance to the hall and red room...
...and it heals on top of the human base, in the hallway.
Karith
Here's one in dark stairs that...
...heals in one of the corners of steam hall.
A booster in the corner of big stairs...
...that heals in the corner of the pillar room.
A really useful booster. Build it on top of the human base.
It heals from the other side of the map, human side entrance, just before pillar room.
Nano
A booster in the place of an egg in the default layout.
You can heal by hugging the wall in upper middle...
...and in the lower middle. This makes it an extremely important booster for every Nano game.
Nexus6
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This is really my favourite one. Just build a booster in your default base...
...and you'll also heal in tall hall.
Niveus
A booster that heals in three different locations. The plant room...
...on top of the boxes in red room...
...and when you hug the wall in crate room.
This one is built in lamer spot...
...and it heals below you in stairs.
This one's really handy for niveus tyranting. Build on the ledge...
...and receive healing from the corridor below.
Credits go to HamStar for discovering the first "super-booster" in karith.
