Since Doom 3 will be out in less that that, I don't really mind it being delayed a bit more :).

the reason is problay CS2. CS Source (CS2) will be avaliable for beta testing (CS:CZ owners only) at the 10th in august. and i dont think Valve wanna release HL2 without "the best fps ever" as multiplayer.. about Doom III: with all the respect to doom III i dont think there is any chance to defeat HL2/CS2. CS is the most popular FPS.