Well, not Half-Life2. But Counter-Strike: Source is just about done, and it's being released online next week, in Valve's latest announcement. Pre-order HL2 through Steam next week (I think you have to drop full price for the game, and it'll come in various flavors depending on whether you want DoD:Source or the HL1 redo) and it instantly grants you access to CS2.
My online addiction for the next several years has just been set in stone. Bring it on, bitches.