Supreme Commander: Forged Alliance
...you can apparently activate *any* Forged Alliance keys onto Steam.
I'm not retarded. I know about that little gem.
Which is why I felt it worthwhile to mention it.
Thank you very much, dear moderator. (snark tag)
EDIT - I feel the need to clarify. That link is not always up-to-date. There are Steamwork games *not* on that list, including Space Marine, and probably a few others.
[Edited by Bacfe, 12/4/2011 1:29:03 AM]