Kagil,
Just so you know.
Furfly is working on a straight port of the 3.x E-commerce module to a ACS 4x package. It isn't a redesign. We are making the old ecommerce work on top of ACS 4x, nothing more. Its for a client project, but we will be making our source available in the next couple weeks.
See this thread on arsdigita.com for more details of the trials and tribulations of E-commerce on ACS 4x:
http://www.arsdigita.com/bboard/q-and-a-fetch-msg?msg%5fid=000b5M&topic%5fid=web%2fdb&topic=
It sounds like what you are interested in is redesigning the ecommerce module to use ACS 4 programming conventions (or OpenACS 4 programming conventions). That is a very good thing and there are people out there willing to help (see thread mentioned above).
One thing you should know is that aD is leapfrogging the TCL version of a 4x E-commerce package and concentrating on a Java version. So the information you found at http://developer.arsdigita.com/commerce-project-central is probably not going to be updated anytime soon and as far I can tell there won't be any further releases from aD with that code.
