We just released another small site built on XOOPS -- for a Sports Recruiting Seminar group, selling tickets. More of a "corporate" site than a community site, we used Oledrion for this one which needed some modifications for US standards, pre-populating the billing forms, and submitting info to Paypal.XOOPS: 2.3.3Primary Modules
I'll note that Oledrion is a pretty good commerce module overall, but I'll have to write up some things about it that I ran into using it here in the US, and I modified it to pull info from the profile module as well as pre-populate the forms for Paypal. Was looking for something that worked well and didn't require the overhead of osCommerce. Overall, did the job, though.