While on the show floor, I got permission from a friend to video behind the scenes at the Games for Windows Booth. Unbeknownst to many, they were enjoying Halo 2 for Windows on DirectX 10-enabled NVidia cards, in some of the fastest PCs yet. You’ll notice a sneak peek of the Live for Windows integration announced, which will for the first time enable you to play on Windows against others.
No details on whether you’ll be able to play Halo 2 on PC against users on Xbox 360, however I did notice a few maps I didn’t recognize while
playing, evaluating the platform. Long Zheng has more on Live for Windows here.