Infinity Ward has said that it will probably reset the leaderboards for Modern Warfare 2 just prior to launch on 10th November.
"It definitely looks like a full leaderboard / level reset is in order just before the release date to ensure no unfair advantages," IW's Robert Bowling tweeted.
Who might have an unfair advantage? Well, the game's now been pirated on Xbox 360, so those people, assuming Microsoft hasn't banned them all by the 10th.
IW has declined to comment on them.