Halo 2 for the PC has been show off at the CES. Among the novelty of finally having this title available on the PC as well as the Xbox 360, it seems that graphical aesthetics of the game are actually improved on the PC, with higher resolutions being available. Even though it's been a long while since the console release, many are looking forward to it and the article had positive things to say:

While some PC fans may scoff at getting a port of a console game more than two years after it was originally released for the Xbox, the fact remains that the PC version of the original Halo sold very well. Fans of the Halo series will be happy to know that the PC version of Halo 2 is shaping up well, and it's scheduled to ship this year.
Little else is is said, though I am definitely looking forward to trying it myself.