Doom III trailer that is showing at E3.
Half-Life 2 Teaser Trailer
I can say with no hesitation that I am very much looking forward to both of these games. My only hope is that I am able to upgrade my system to take full advantage of the technologies in these games before I play them!
Half-Life was and still is one of the greatest games that I have had the chance to complete. Even with its outdated graphics, I could install the game right now and have a blast playing it because the storyline is great and the gameplay is second-to-none.