Hello,
The first thing notice when I come to your site is the fact that the menu is disjointed. I would try to consolidate the menu into one line, as that would unify the page a little more. Second point to note about the header is that it is taking up a lot of the page real estate. The average window size that you should target is 800 X 600(resolution) and as such I would try and make the header a little less in height.
I would also agree with fraswerpogue in that the image in your header needs to be changed. The image immediately causes me to think, "This is a canned site", and as a result of that first impression I am less likely to take a look around.
I will take a further look at the other pages on your site a little later and get back to you.