Did you get the IE problem fixed? The only difference I'm seeing is that the text color for the content div is white in IE. Have you tried putting color: #000; in div#content as a test? I haven't gone through all the source, but there's probably something layered wrong or some parent style passing the color (or transparancy) down.

I guess it could possibly be a z-index issue too, but I didn't see any z-index in your css so it would be a strange problem if that's the case. However, I have had that problem before so it's not impossible, it was due to the way I had my padding and images set in the particular layout I was working on.