Apparently my LiveJournal account was hit by the recent "bantown" cross-site scripting attack. Thanks to Mav for pointing this out. Apparently my interests and e-mail address were both changed and LiveJournal responded by suspending my account. All this to gain control over a journal that I hadn't ever used for original content. (When I did use it, it was merely a mirror for Aspects.)
Update Sat Jan 21: The LiveJournal abuse team handled this very quickly. My account has been reinstated and it doesn't look like the hackers did anything annoying with it.