Hi Peter,
Just dropped in to this thread, so I've been having a look at your site. I operate at 800x600, and I think its the case that something like 1 in 3 users are still at that resolution. I'd prefer a site that doesnt have a fixed layout, but allows the browser to flow the text and tables to fit the resolution. Still, that's just me.
Like the others, I think there are too many images on the home page that don't add anything to the message - I can't see the text without scrolling dowm, and so its not immediately obvious what the site is about. If you must have all those images, then put the text frame above them. But why not use some of the images on the other pages, which I think look a bit bare and wordy as they are, although the information is probably extremely valuable - break it up a bit to make it more palatable.
.... and on a quick revisit, I see that you've literally this minute made some more changes
Martin
Edit - the new home page is m-u-c-h better, with all those hooks to make people delve deeper. A few of the links are wrong and point at the adverts page, btw.