Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email firstname.lastname@example.org.
We just recently created an eCart Comparison chart (http://www.mailware.com/mailware/integration/cart-comparison/) that shows eCart solutions including ZenCart, osCommerce, and Magento. It breaks down into general info from payment and order processing to shipping and then breaks further down to features each category provides. Hope that helps.