Using Firefox and IE:
images are stretched horizontally a bit. make sure they stay in the right proportions.
The images are also not sitting in their tables properly
Your header repeats at higher resolutions
Your font is a little questionable.
I think you should switch the latest news and 2007 activities columns with each other.
The Latest News column continues off the page.
That Google Calendar looks craptastic in firefox, but nice in IE
Maybe put a small nav bar at the bottom of the page, and copyright information.
These are all just tiny little details that I mention only because you asked. Otherwise it looks and navigates great! Nice work!