Nice clean, corporate look. I would have liked to see it fit a 800x600 window as well, but that would probably mess up your menu. Menu is very nice as well, although a little slow initially; i second indicating a third level menu.
I would make the very pale blue background from the text headers a little darker to make them stand out more; at present, it's barely visible, and i do like this way to emphasize headers.
Lastly, i recommend a page footer (something like a thin horizontal line, and maybe a copywright notice in small type beneath it) to indicate to visitors when they reached the end of the page. Whenever i spot something like that, i always feel it gives the lot an extra professional look.