The screenshots of the game are not how the game will look, as they take screenshots of games at much higher resolutions than the Xbox can pump out.

But here's some candy for you:
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And you can get some videos from Here.
A clip of Halo2 Multiplayer:
http://media.xbox.ign.com/media/482/482228/vids_1.html?fromint=1

And here's a large video of "The Making of Halo2" showing the wonderful funderfull world of game making:
http://download.microsoft.com/download/7/a/a/7aa5f21b-09d6-41b6-a647-b3f2da348db 2/Inside_Halo_2_Preview_2Mbps.wmv

And here's some voice acting outtakes:
http://www.bungie.net/Games/Halo2/page.aspx?section=AudioVideo&subsection=VoiceO uttakes&page=1

Two more images:



And here are some high resolution scans of the Halo2 preview in Junes OXM magazine:
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page 7

And one last image:
http://img14.imageshack.us/img14/8044/Halo_Resize.jpg

And all the current screenshots can be found on Bungies site in 1600x1200:
http://www.bungie.net/Games/Halo2/Gallery.aspx?Gallery=Screenshots&page=3
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C++ Should Have Been Called "D"