I'm just about to create a new weblog and chose a title with lowerthan / greater than signs in it. They seem to be handed through to the database without being escaped, so the result was a bit different than planned ;) Of course, these chars prevent the text inbetween from being displayed. I think it would be easy to do a search on the text data when submitting the form and replace special characters with the corresponding HTML entities.

In case this topic is through already take my apologies, but I quickly scanned this page and didn't see anything the like.