http://majornelson.spaces.live.com/blog/cns!FAB4B8088A70F52!590.entry

MS banned a bunch of users with modded firmware, but it seems they also may have banned a few innocent folks.

If you see the error mentioned in the above Blog entry by an MS employee (major@microsoft.com) then you're hosed and your xbox just became a paperweight with regards to online gaming!