I posted sometime back about a E-Commerce solution. I'm using Joomla currently and was going to use Virtuemart as my shopping cart solution.
I've now decided that won't do everything I need and am mainly looking at CRE Loaded or X-Cart but am open to others
Two important things I need are:
Ability to link from the store back to my main Joomla site.

Ability to do multiple tax rates within a state. I live in Colorado and have one tax I charge inside the city I'm in, another for the county I'm in, then through the Denver metro area depending where someone is rates vary.

Ability to offer ebooks and other downloadable products.

I know CRE Loaded offers a content management system now. What is that like? If I choose CRE I may switch away to Joomla to that system.