After changing ISP's, I started over with new product categories and products. The old product categories that must have been deleted (from the old site) are showing up on my Google webmaster tools as site errors.
Here is an example:
http://www.tohomeshop.com/c-34-.aspx Redirect error Nov 18, 2010
The category name is deleted but not the category itself. So far no one seems to know what is causing and how to fix it. They are not showing in the sitemap.