Fileplanet has the hi-res full length movie or you can go to
www.halflife2.net and get all the quicktime movies.
I've must have seen it at least four times already and I still can't belive it.
Word is also that it's scalable to run on a 900mhz with a TNT2 card but I wonder if it would still look that good. I have a 1.2 T-bird with a GF4Ti4200 and I still plan to upgrade for it.
Everything about this game makes me very excited. Can't wait.