4
Very polished looking. Perhaps a little on high tech/sci-fi looking... but, perhaps that is appropriate for your intended audience. Definitely looks professional.
Using Mozilla Firebird 0.7, the "Home" and "Search" links in the orange tab at the top didn't take me anywhere. Also, as a previous post mentions, all the content is on the right-hand side of the screen in Mozilla. But, I note that it appears the same in IE 5.5, so it appears intentional.
Great work.