these may be part of the 20% of undone work, but here's my 2 cents. Using FF:
1) On home page, the bottom 3 curves are a little jagged
2) On "contact us" page, the nav bar isn't working. I would imagine that eventually, you will make this a global include
3) Some pages have ".htm" extension and others have ".html" extension. why?
4) It would be nice for "contact us" page to have a form, as opposed to just listing email addresses
5) Some pages lack headers
6) In general, your nav bar is jumping up and down b/w pages.
7) In general, a lot of images representing text that I think would be better as text, for page download/seo reasons.

I would probably space out the text in the middle bubble on the home page, for readability reasons.
Other than the above:
1) I like the simplicity
2) I like the fact that you are giving the user the choice of whether or not they want to replay the flash movie, as opposed to having it play continuously, although I would probably get rid of the "replay" button altogether.
I hope these help. Good job by the way!