I reported today that Halo 2 is the reason Microsoft has yet to cut off support for the original Xbox Live. Splitting from the old Xbox Live architecture would allow Microsoft to enable support for more than 100 people on your Xbox Live friends list. Thanks to Bungie's comprehensive community website, we actually know how many people are playing Halo 2 at this very moment.
As of this publishing, Bungie says there were 1,503 gamers playing Halo 2 online. In the past 24 hours, there were 10,275 players who logged into Halo 2 and started 17,205 matches.
10,000 players is nothing to scoff at, but is it enough? Let me know what you think.