I just noticed this on my blog, in this post look at the second comment down (and the ' bug happened while making some posts)
When using a " ' " in a post it is posted with a " / " leading it. I am not sure what causes this but when I modify the post and delete the slash it seems to stay away.
Also whenever I put a link in a post, or a commenter does it is followed with the URL to my blog. You can see this as well in the second comment to this post, the URLs the user posted have my URL in front of them.
Both of these may be a result of my theme but I don't see how they could be since it is primarily the default theme with a different style sheet.