Personaly I will buy Valve games...its Steam that sucks, not Valve.
I have my HL2 and CS:S running on FC3 2.6.10...works fine.
However you may run into the Error 21 issue if you haven't followed the instructions yet on
www.transgaming.org/forums
It took me a while to get it working...but I found Point2Play was a lot easier to get Steam going than Cedega was. Maybe you should give that a shot..
ah not dissapoint you but HL2 only runs in DX8 mode for Cedega, it looks really crappy. I get around 50-70 fps in Cedega. CS:S I get about the same. In Windows I get 120-185 fps.
BFG Geforce 6800 GT OC