We had a great presentation at the Atlanta Joomla Users Group last night. Paul from http://netproffitt.com went over the integration possibilities with Joomla and Magento, a very powerful open source shopping cart.
Suffice it to say that Magento is miles ahead of Virtuemart in at least three areas:
If you’re looking for a very simple shopping cart with Joomla, Magento isn’t it but RokQuickCart is a good option. Paul’s presentation is embedded below.