Hi,
The site is certainly clear, but I'd personally prefer to see a few other colours rather than the monochrome, grey/green look you have at the moment. A few more colours (within your colour theme) might help give sections of your pages more identity. A couple of carefully selected graphics might make the pages more appealing also - there's loads of free clip art available. Photos of people and faces seem to draw viewers to parts of your text. See this site:
http://www.poynterextra.org/eyetrack2004
The naviagtion bar on the left is not visible on all pages if you use the Firefox browser. Works fine in IE6 though. Here's a link to a free CSS menu generator that you might find useful:
http://www.webmaster-toolkit.com/css...enerator.shtml
Hope this helps, and please check out my site too!