We're kicking off a brand new open source effort to build a kick ass
Rails shopping cart application that will be 100% open source.
RailsCart is meant to be integrated with custom Rails apps using the
plugin mechanism.  This project will be focused exclusively on the
general shopping cart problem and will not attempt to implement
blogging or any other CMS type features.  Those needs are better
served by other projects.  RailsCart will, however, be able to
integrate with applications using those technologies.

Since the project is open source it will require the participation and
dedication of several skilled programmers.  I'm personally new to
Rails (although not new to web programming or open source) so I could
use all the help you can provide.  Just ping the list if you want to
contribute.

Sean