Thousands of botting WoW accounts were hit by the ban hammer yesterday:

We’ve recently taken action against thousands of World of Warcraft accounts that were found to be using third-party programs that automate gameplay, known as “bots.” We’re committed to providing an equal and fair playing field for everyone in World of Warcraft, and will continue to take action against those found in violation of our Terms of Use. Cheating of any form will not be tolerated.

At around the same time a year ago over 100,000 accounts were banned, so the efforts seem to be paying off despite the influx from the recent expansion.

Join the discussion on the official forums.