Can I play Steam games on my PS3?

Well the thing is "Steam" is a PC program, nothing more, so It stays in PC.ValvE games will be linking their PSN Games with their Steam games. I do not know to what extent to what games will be sharing servers with PSN and PC, but for example Portal2 players can be from the PSN and play PC players, Burnout Paradise is another linked game , just to name 2 examples. Also if you have a PSN active, you can activate it thru Steam and collect achievements and such.