Due to a bug, Internet Explorer 7 will give this page a horizontal scrollbar that will allow you to scroll nearly twice as wide as the page actually is. This page should not have a horizontal scrollbar at all, if you see one, you're seeing the bug.
The horizontal scrollbar is caused by the right floated italic text. Although this page uses font-style:italic to make it italic, you could use <em> or <i>, and it also doesn't matter if the element with the text is floated right or if it's contained in some other element that is floated right. If you've got right floated italic text, anywhere on the page, this bug will show.
If you aren't using IE7, below is an image that shows how this page is rendered in IE7.