Hi Tim,
Thanks for your interest. Sorry, at the moment we're not very focused on who uses loadUI, but rather just making it as usable as possible. We're spending all our energy on creating software that's as good as it possible can be (also we're really just having fun) and haven't gotten around to the sales and marketing stuff. The commercial release is scheduled for December 2011 earliest, and as we're closing in that's probably something we'll look into more. The commercial version will be just like soapUI; a little extra, but the Open Source version will be super Testware by itself.
Since we don't have a commercial product, we don't have "customers" per se, we just have a lot of users. Users we love. A lot.