Half Life 2
This is the official first full release of VALVe's popular multimedia software platform. Steam is like a cross between Gamespy and something good. Not only do you get instant messaging, buddy
lists and buddy finding, along with a server browser for classic and ever-popular VALVe games (most notable being Counter-Strike), but you also get access to exclusive VALVe content like Half-Life 2 videos. Steam will replace the old WON id's for games like Half-Life. and if you have a valid cd key from a VALVe software title, you'll still have access to the gamut of VALVe game updates and other media.