UN-SOLVABLE MYSTERY?

Ok – I’ve a plea for help. I’m building a theme at the mo, and everything seems to be going pretty well. I have one problem however, and I can’t even begin to see what might be causing it – can anyone help…?

Have a look here: http://www.haizeak.com/development/

In FF and IE7, the site displays perfect. However, on IE 6.0, the last few letters of the sidebar content (a link in this case) are DUPLICATED under the last post before the footer. What the F is going on here?

Help very much appreciated!