This week's Halo 3 Weekly Update by Frankie has more about Halo 2 than Halo 3, but that's no reason not to read it. At least, not a good reason. There's good news and bad news. The good news is, Halo 2 for Vista won't require DirectX 10. The bad news is, the Clan playlist is going away due to underutilization.
We've archived the update for May 26 in our Halo 3 Updates section.