The Magento Commerce DataFlow module is a powerful and versatile tool that enables you to import legacy data from your old e-commerce databases into Magento.  Currently, only two data adapters exist for DataFlow - one to import/export products, and one to import/export customers.  Our groups focus and goal is to provide data adapters for virtually any legacy schema to enable smooth and easy conversion to Magento Commerce. 

This group’s focus is limited to data adapter requests, design and implementation, as well as support and troubleshooting our code.

Also, a guide to developing DataFlow adapters is rumored to be coming soon!