NEW LIST (current as of May 8 2012):
1x Warcraft III + Frozen Throne expansion keys (Battle.net account required)
2x Starcraft + Brood War keys (Battle.net account required)
1x Half-Life GOTY key (Steam account required, adds all original Half-Life series games + Counterstrike and Day of Defeat)
1x Counter-Strike key (Steam account required, dunno what it contains... sources say Counter-Strike, Condition Zero)
Golden Axe 1+2 (Steam account required, Genesis Classics, tradeable copy from Holiday 2011)
Want: Offers, games on GOG
I don't own. NO INDIE BUNDLE OR DESURA KEYS.
I probably already have 'em all. So don't bother.
I'll trade a bunch of these for The Witcher 2 (I know, I know) or Alan Wake here on GOG.