The design could be better, there is a minor alignment issue in firefox 3, it's somewhat difficult to read the text in the banner in the header, you should work on the design a bit more. It's difficult to read the text in the navigation of the site in the left column you should change the color of the text.
It still looks different in ff3 and IE7. The background of the sections are blue in ff3 but in IE7 it's white. Overall the design looks good (in IE7) .6/10