As reported on wikipedia-l, zh was the subject of a large-scale automated attack. Approximately 3000 pages were deleted over the last two days. I just wanted to point out that this could have been prevented by the use of an appropriately configured proxy scanner.
Scanning for proxies may require some administrative overhead in terms of replying to automatically generated intrusion detection messages, and in obtaining an understanding from Verio and any other upstream network service providers. But it would certainly have its benefits.
Our response to this in human terms was less than ideal, but I'll post my thoughts on that to wikipedia-l.
-- Tim Starling