Nebu announced on the front page that another wave of bannings went through, these ones specifically targeting players using third-party programs to automate their characters.
In the US and Europe, we recently banned several thousand accounts associated with the use of botting programs that fully automate player actions, such as killing and looting monsters. We take these attempts to bypass the rules and standards of the game extremely seriously, and we will continue to aggressively monitor all World of Warcraft realms in order to protect the service and its players from the negative effects of cheating.
GMs and other administrative members have a very short fuse when it comes to botting, so if you've ever considered downloading one, I would recommend you think again.
