I am working on a website for a client and all of a sudden I see the last two characters of my last float being repeated on the site when I use Internet Explorer 6. This is a bug in IE6 and can be fixed the best way (imo) by putting a condition in your comment that IE should skip it, like this:
More info and workarounds: http://www.positioniseverything.net/explorer/dup-characters.html