I'll start by saying... '*beep* IE.'
Now... I noticed something on the Sample Content Layouts page  with the two column variants... wrapping the text in a paragraph, or putting a line break br after the image fixed that issue.
As far as a three column layout problem... I don't see any issues on the Web Dev Net site ,  using IE 6.0.2900 on XP w/ SP2.
If you still see a problem, can you submit the URL of the page with the problem, and the full details on your browser, version etc? Screenshots are helpful as well.
 http://www.unl.edu/webdevnet/documentat ... tent.shtml