http://bungie.net/News/TopStory.aspx?story=halo2vistaannounce&p=6136047
Amazed I didn't see a thread on this earlier.
Bungie has announced they're (well, not they, but another studio at Microsoft Games) writing a version of Halo 2 for Windows Vista. Exclusively for Windows Vista.
They're writing it exclusively for Windows Vista, so you can't run it on Windows XP. They say this is because they want to take advantage of blah blah blah. What advantages will Vista have over XP in terms of gaming? DX10? If it's just DirectX 10, why won't that be available to XP?
What an excellent way to push Vista onto millions of desktops right out the gate...

All conspiracy theories aside, I'm super excited for this. If any of you were hardcore Halo Xbox fans, and then played Halo PC with its numerous and endlessly entertaining mods, you'll know how exciting Halo 2 on the PC will be.
Besides, it helps to bridge the gap between the Halo movie and Halo 3, presumably Bungie's next project they've been working on. I say Halo 3 just because it makes a lot of sense to release Halo 3 around the movie and now PC game. Why would you release a completely different game while a movie and PC port are going on?
/ends random thought stream
//jumps up and down
-Eric