Critique CSS layout (My First ever 100% css Site)

I would love to have my first CSS site Critique, to see where I could
improve on the CSS... I can't really change the design of the site, as
it is run by committee. But I can at least clean up the code or change
the under workings of the code, as I have 100% control over that.

http://www.naturaljourneys.com

--The Master

P.S. FYI, anything located in the sub directory of /shop/pc/ the code
can be a bit of a monster as it was a pre-built open source Shopping
cart I purchased. I have cleaned it up enormously, by removing all the
font tags and IE specific attribute tags that I could find. I still
need to do some clean up with it so that the pages that don't validate
will.

Otherwise all the static pages not in the /shop/ directory should
validate 100% and I'm completely responsible for the code found there.