You guys are missing the point.
Let's say 5 years from now Valve dies for whatever reason, and steam goes with it. Now say a year after that I decide I want to play some HL2. However, I don't have the files backed up, and since steam is dead I can't download it again.
In this situation...
Option 3 or 4 most likely. I guess 3 since CS is already on the xbox.
In a very recent thread, the gamespot interview maybe Doug said there would be no official Deathmatch OR Co-op. I would assume that applies to xbox as well because if they were going to make DM or Co-op for xbox they...