Glad to hear it! Being able to easily drill down and see exactly where the results came from would be a nice feature. I don't want to do any Ubercart-centric stuff in the main module... But if I allow sub-modules to render their own stats, then the Ubercart sub module (or any other) could easily add links to it's stats table that point to tables of orders (or any other data) for each referral source selection. I think I'm going to look into doing it this way, and implementing drill down for user registrations, Webform submissions, and generic FAPI form submissions as well as Ubercart. I've got another project I need to finish up before I can do this, but it's really, really close to being done. If you want to do up a patch in the meantime, feel free.