Seems they have found some new sort of hack, not sure how common this is but thought id post a warning here.
http://www.youtube.com/watch?v=LBOrDptVtak&feature=player_embedded
A long video but if you watch for even the first few minutes it seems the guy can see through the fog. be warned :)
Yeah, In my opinion he is definitely up to something.
Maybe he found the "fog" down function, or maybe he did a trick with something like real time replay feed.
I'm glad he got banned.
Looked into this matter and how its possible and found out that its not really a hack, his actually useing a trainer, that enables him to disable the fog. He turned it off at the end, when the commentator said that his screen was holding in 1 place right after he gave up.
http://kotaku.com/5637844/blizzard-prepares-to-ban-starcraft-ii-cheaters