GT (whatever that was) scrimmed sg (now dead) several times, as well as ddos. There were other matches GT vs MAD, >< vs ddos (a long time ago), sg + ddos vs GT (someone really should post the demo of that somewhere, it was epic). I'm not sure how much scrimming NN, pk, and DSPro have done, but the other active clans have done a fair bit in the past year or so. Also there was the trem open, but that was essentially a scheduled PUG. So there has been quite a few.
In fact, it is very possible that meisseli has garnered his view on dretch strength almost completely just from scrims, as newer players really negate the necessity of serious dretching. That said, I'm not sure when the last time messeli has *lost* a scrim as aliens was. ddos is insane with maras.
My one comment on scrims in 1.2 is that if both teams manage to reach s3, SD can still define the game, at least with relatively few players (up to 4 vs 4) and balanced teams, when camping is still fairly effective.