Not that every other fan site hasn't posted this, I guess I will too
Valve unlocked Half-Life 2 at midnight PST tonight, and supposedly the SDK will follow soon.
So, give us a little time to sit back and enjoy the game ;) I suggest everyone else do the same (even if you're using a Geforce 2 like me).
Meanwhile, check out
AMX Mod X, which just released version 1.0 for the original Half-Life.