Adding to the list of writeups, Louis Wu has put up HBO's coverage of the Halo PC Fanstock event. It features quite a few photos, and there's a promise that in the next few days there will be screenshots as well. One particlarly interesting tidbit that I didn't see elsewhere:

There will be a dedicated server for the game available for download soon after release. It will be free. It will require resources from your Halo PC CD... but it will NOT require that you leave the CD locked up with the server. (That is - if you want to configure a computer to act as a dedicated server for the game, but still be able to play on another computer, you'll only need to buy one copy of Halo PC.)

Certainly good news for those who want to run public Halo servers. Now, where's that Linux version?