Hi Jim,
The ecommerce package is not the ec2 project, but ecommerce does benefit from some of the features developed for ec2, including importing product data from other websites (as a means of keeping pricing current) and flexible procs that help with importing, maintaining and displaying product data.
Ecommerce works with postgresql.
The hardwired shipping costs have been moved to a single proc to maximize flexibility in how shipping is calculated. There's also a shipping-gateway package for interfacing with a shipper's API; I haven't used it, so am not sure how current it is.
The underlying libraries of procedures and data models that make ec2 are almost complete. With a few years of experience with double entry bookkeeping (including audits) and building finance models for energy production projects, I believe I now have the experience to finish building ec2.
The hurdle at this point is dedicating revenue building time to complete ec2. To offset, I'm building a couple of web apps which also build on and add to the ec2 library. The process has been slow paced, but the goal is in sight.
cheers,
Torben