I like the 2 screens (right & 3rd bottom) where you can see the difference between Valves 1997 Half-Life release and the up & coming Half-Life 2 scheduled to release in September this year.
That mixed in with the stunning scenary that is becoming evident in this sequel will surely give Doom III a run for its money and please all the Half-Life fans that have stayed true to the game despite all the troubles and updates (need I mention Steam?). I am personally looking forward to a Counter-Strike mod for HL2. I cant wait!