Footer exploit?

For starters, provide the URL of your for us to look at.

You may have been hacked, or you are just using one of those encrypted/obfuscated themes that put other peoples links on your blog. If it’s the theme, the easy fix is to use a better theme from reliable people.

If you are hacked then you’ll need to do some work. Start with reading these links.

http://codex.ww.wp.xz.cn/FAQ_My_site_was_hacked

http://ww.wp.xz.cn/support/topic/268083#post-1065779

http://smackdown.blogsblogsblogs.com/2008/06/24/how-to-completely-clean-your-hacked-wordpress-installation/

http://ottodestruct.com/blog/2009/hacked-wordpress-backdoors/