Bungie.net has word that the version 1.0.8.616 patch for the PC edition of Halo is now available (thanks Gamer's Hell), pointing the way to this forum topic with downloads and info on the new version. The patch removes the CD check in the shooter port, and addresses some bugs, and in addition to client patches for the regular and custom (multiplayer only) editions of the game. There are new corresponding dedicated servers, and to avoid confusion with the beta patches that preceded this release, the new version is not backwards compatible with old servers, and when the auto-patch hits the tubes tomorrow, the new version will be required for multiplayer play. Interestingly, the bug fixes are characterized as a favor from Bungie to the community, as they are actually updating Microsoft's game for them, and as such, future support is not guaranteed:

If you haven't been following the pre-release threads, this patch contains several fixes for server-crashing security bugs, and that's it. As I have discussed elsewhere, anti-aimbotting is an arms race that we're not going to enter for this old game, and this patch doesn't address that or any other feature-level changes. I should also note that Bungie does not officially support Halo PC (which is owned by Microsoft, not Bungie) but since the build machine is under my desk and not at MS, I fixed these several bugs as a favor to the community. I can't promise any future support, nor can I open-source the code for community development.