Major Nelson has posted the list of the top played game on Xbox Live for 2006. One mild surprise is that despite only being available the last month and a half of the year,
Gears of War was the top game for Xbox 360 played on live. Other tops were
UNO for Xbox live Arcade and
Halo 2 for the original Xbox. One caveat is that multiple Gamertags can play the same purchased copy of a XBLA game, so the order may be funky due to this. The complete list: