The Warcraft III Website (thanks Frans) has word that Blizzard has busted out the banning stick once more and has banned a whole bunch of accounts due to online cheating:

A number of additional accounts and CD keys have been tied to the use of a hack or cheat program while playing Warcraft III on Battle.net. In keeping with our aggressive stance against cheating, we have permanently closed 53,928 Warcraft III accounts. 8,168 of the Warcraft III CD keys used with the now-closed accounts have been banned from ladder play for one month, and 3,331 more have been banned from ladder play permanently. Repeat offenders risk having their CD keys disabled, which will result in the permanent removal of their copies of Warcraft III from Battle.net.

We will continue to monitor Battle.net for cheating and take action as needed. If you would like to report additional instances of hacking or cheating, please notify us at hacks@blizzard.com. A false report filed by one player against another will not result in the actions described above.

As always, thank you for your continued support; with your help we have been able to keep Battle.net a fun and safe place to play Blizzard games.