New details for Halo 2 PC
On the good side, even though Halo 2 for the PC will require Windows Vista to run, consumers will be able to keep their old video cards. The reason for this is that the game will not require video cards compatible with Vista's video game component DirectX 10. That will save a few dollars thankfully.
On the downside, if you are itching to take on Halo 2 Xbox users when the game is released for the PC, it doesn't appear that Bungie will make that dream a reality any time soon. According to the Bungie update, that Xbox players have a two year jump on PC players "means a level playing field would be impossible." Add to this that Halo 2 PC will feature a map editor, and new maps created specifically for the PC version, and it would be unclear how the two systems would interact--at least for now.
Read more at GameSpot.