In another round of account bannings, Blizzard smote over 300 accounts for using 3rd party programs to slog through levels, crafting and PROBABLY FISHING TOO! Quoting:
Blizzard Entertainment is committed to maintaining an environment of fair play in World of Warcraft. As stated previously, the company has a zero-tolerance policy for cheating or hacking of any kind. Players caught using a bot program to automate any of their characters’ actions will have their characters removed and their account banned. They will not receive a warning. Over 300 accounts have already been banned for offenses of this nature.
If nothing else, regular bannings should clean up server clogs.