Can't give you an example of something vaguely remembered, but you can take my code from a page
(stoopid google) and add a right float in the overflow section. It's mostly IE didn't like the lack of set width on the overflow box, so a right float would stretch the page width to a bazillion pixels. Before I refactored the code, I had IE giving some elements a really large left margin while the better browsers got a right float. Basically I just tried to use left floats instead.
There was a similar issue I think only IE6 with widthless absolutely positioned containers and right floats inside them. The problem would likely also occur if you had align=right and was really caused by IE not knowing what to do with widthless containers rather than the float itself.