We've surpassed lots of cool numbers in the past, including numbers of total players, hours played and all that stuff, but we thought we'd note that at  as of around noon today, a half-billion games of Halo 2 have been played on Xbox Live. That's a lot of games. To clarify - that's actual games, not player-sessions. That also doesn't include games we lost because the website was down, or through other technical issues. Again, this proves that my scheme to attach Halo 2 sessions to my Paypal account would have been genius. A half billion! WOW!