This module is intended to simply extend the functionality of the the excellent Node Import module. The maintainer of Node Import has expressed a desire for that module to remain focused on importing nodes. So this module's intent is to focus discussion and efforts on extending Node Import to support updating nodes as well.
While this module is still very much a work in progress, recent code contributions have dramatically improved it. At this point, it should work by default with product nodes using the title as a unique field. It supports Node, CCK and Ubercart database fields.
The discussion that led to the creation of this project, along with the original code for this module, was posted in.