hahhha fago@drupal.org: i was just about to post how workflow-ng will be integrated into drupal 6 -- I saw the rules engine project page, but I'm not sure how complete it is?

It'd be good to hear that it's feature complete by march, since this is a major part of ubercart now. Perhaps if we're working on ubercart while you're working on the rules engine, we can identify some of the issues with workflow-ng and hope that they can be fixed in D6.