I like the simplicity too....a site like this is likely to live or die on content rather than looks I think.
You might want to add something to the page title (<title) tag) to describe what the site does - better for search engines. This applies to the homepage and throughout.
Your code starts with:
In order for IE to behave itself that comment created by the DW template needs to come after the doctype - I haven't viewed in IE but that's probably a factor in the compatibility issue referred to above. Also I think you'll find it's <html> not <hmtl>. Use the w3c validator to pick up this sort of thing.
<!-- InstanceBegin template="/Templates/main.dwt" codeOutsideHTMLIsLocked="false" --><!DOCTYPE HTML>
Your "Home" link should go to "/" not "index.html" - otherwise Google may see these as two different pages.
...or much more irritating, according to your point of view.
You can make header of website more attractive by adding flash to it.
Fascinating to learn that there were 149 days of rain per year when I was at college...