You guys need to do something about your 'speed hack' thingy.
Maybe it was because I was lagging a bit because I was downloading another game, maybe it was because game crashed on me before that or maybe it was just because I obliterated an even con warlock on my Barb earlier, resisting root after buffing vs. it (and getting a lag spike right before the final blow) before I crashed. Spells I used in this battle was unstoppable madness, kick, southcross, a sword buff, and whatever that other slashing first skill is, and sprint or leap or whatever the run speed buff is.
If your own game's lag is causing false positives, you need to do something about that.
also, just as I got the ban the game completely locked up and Steam itself crashed. I brought Steam back up then closed game then tried to log back into game for the speed hack message. I do not know if any of that had anything to do with this or not.
Here are the processes I was running at the time the game locked up and Steam crashed:
http://img13.imageshack.us/img13/3769/g6r0.jpg