2009/2/4 Sam Korn smoddy@gmail.com:
I think the Ukranian Wikipedia must have a welcome-bot with enotif installed and on by default. I just got a very similar email having gone to uk.wikipedia.org to work out what was happening!
Quite a few projects do, now - I've had it happen from three or four (occasionally with a helpful English note at the end, on the grounds that this is the language most likely to be spoken by a random visitor).
It's an unexpected effect of single-signon; when you first visit a new project, it recognises you as signed in elsewhere and so creates the new account for you. The bot then picks this up from the new-account log...