Yes the left menu needs some work and also are you using a php cms to add or edit the content ? or are you maintaining it manually ?
Actually, I know that IE7 will provide positional css support, and it is coming out this year, so I do not intend to change the menu. It already works in the next generation browsers and that is what is most important to me. I could do the same thing with a large png image map, but I dont want to sacrifice bandwidth for Microsoft Theyre just going to have to listen to the W3C from now on.
And the site is actually a web app that I created with ruby on rails. My own custom content management system. It runs and looks like a static site thanks to caching. However, all of the content is being pulled and formatted on the fly from a mysql database.
I know that I could have used phpnuke, however, I am going to have editors all over the state submitting content(including images), so security is very important to me. And I also wanted it really light weight and clean.