I'll be back in a little while with a more detailed (and, I hope, helpful) critique, but I should point out right from the start that I'm not the only user who keeps Java (and Flash, via a Flash-block extension) disabled in the browser. I was going to say that your pages needed some sort of titling element -- until I did a View->Source and saw that you're using a Java applet for that purpose.
There is only one piece of advice I can give you about applets: don't use them. Ever. They made sense twenty years ago, but there's not a lot you can do with Java applets that you can't do without them, and there are so many security and compatibility issues with them that they're simply not worth using anymore. There is a better way, and we can help you find it.
There are other problems as well, but none that can't be solved, and part of giving feedback is suggesting solutions to problems. That's why I'll be back later -- it's going to take a while to come up with some tips that will make your site more readable, more usable and a little more modern.