You guys have a nice looking site! Also good job getting the AJAX links working. They all seem to work fine for me in Chrome. While AJAX links might make the content load faster and make for a more seamless browsing experience, there are a few downsides to this approach that make it generally discouraged.
#1 was already mentioned, which is it causes the browser back button to become non functional. As was posted, there are work arounds for this.
Just a few things to keep in mind and to weight against the benefits. PM me if you would like any more information on how to implement these