Recently noticed something strange with my blog's template... Some sidebar titles and footer titles have shrunk in size for no reason... The zeriouz link partners at the footer missed the "add your site" link all by itself with no editing from my part.. happened before, and I fixed it just to discover today it is missing again. And to the most disturbing part: Just discovered someone did some "link injection" as I believe it is called into my footer file.... lots of spam links lying there in the footer code... these links are invisible to view but only in footer code.
If it's a wordpress blog then it looks like you've been sloppy when upgrading - there's a known way to do sql injections when the old files aren't removed. There's a new version out - upgrade properly and start the cleanup job.