I really like your site and think that you have done a very good job. I would suggest that maybe you should think about the placement of your google ads. The reason for this is because at the moment when your site loads, there is a long way to scrol down until the visitor actually sees any content.
Also I think that maybe the navigation could have a background colour so that it seperates the main content and makes it easier on the eye.
I hope those couple of pointers are of help to you and good luck with your site
