My server was hacked
Last wednesday, I checked my blog and it had been hacked. wp-header had been edited and borked. Nothing in the database had been touched. It was a scary experience, but I got the server back up quickly. I backed up the database and restored it. Apparently there were some encoding issues, thus the weird characters everywhere. I updated to the latest version of wordpress and everything seems to be fine.
I think it was just a driveby attack, nothing aimed at me personally. I have been working on blogging more and getting links to my blog from other sites. Oh well. Time to restore the db properly I guess.