i have 7 half life 2 vids, all over 50mb the biggest being almost 700mb! and i have the e3 doom iii both games will be great. But I give my bet that Half Life will be the game of the year, not doom III. Why? Because of multiplayer and because of world interactivity.
try
http://www.gamesdomain.com/movies/1389.html to download half life 2 videos. It is slow and the links do not always work, but its worth downloading.