First, I'd like to say that you've made a very good job!
My suggestions (I'll try to focus on things that haven't be already suggested):
* Try to get rid of this image slider. It's difficult to pay attention with this huge thing moving.
* Your logo is a button equals to other buttons on your page. It's quite confusing to me.
* Try to work with tables only when you're really want to make use of a table and not as a way to organize your layout. You'll find out that this approach will help you to save a lot of time to maintain your website.
* Make use of standard icons: I saw some icons in 3D and others that are really similar to "cliparts".