It actually looks fine in ie8... ie8 renders similarly to Firefox as far as I can tell. Previous versions of IE are what you need to worry about.
The content seems to be pushed down because of the width of the content wrapper being too wide to fit in the content area. I think you can fix it by reducing the content area a bit like:
#outerWrapper #contentWrapper #content {content2.css (line 103)
margin:0 0 0 236px;
padding:0;
width:650px;
}