Just in case you haven't been keeping up with the recent Halo 3 news, I'm going to fill you in. I can't control my excitement over the last three videos I've seen.
The first is the announcement trailer, which gives me goosebumps. It's that exciting. It's a little over two minutes. I generally don't swear much, but it's ****ing awesome. It can be found here (don't worry, it opens in a new window. So do the other two links).
The second is Bungie's seven-minute special about Halo 3 and it's recent trailer. There is no word to describe how incredibly happy/excited/crazed I felt when watching this. That one is found here.
The last of the movies is an IGN exclusive. Fortunately, you don't have to be a member to watch it. It's mainly about Halo 3, but the first few minutes of this fourteen-minute giant are about Halo 1, Halo 2, and their general success. A lot of it is speculation. It's definitely interesting , but didn't put me in a state of... looking for a word... pure bliss that the other videos did. It's found on this page.
Make sure that for the last two videos, you watch low or medium resolutions. And don't stream them, you need to save these massive files. Streaming any of them is very slow. And if you even think about watching the high resolution videos, you better have a lot of time to burn while it downloads. You'll be glad you saved them to your computer, and the resolutions hardly make a difference. But no matter what you do, stream or save, and no matter what the resolution, you'll watch these over, and over, and over again.