Our prediction market product is working out just fine, and is 99% of our work. We kept needing a better group email tool to use though amongst ourselves and our clients (as well as our technology phobic families) so we spent a little time building tgethr. It's come in real handy with our main work.
Just the other day we had to get a bunch of different staff from our customer and Inkling in a group to troubleshoot things related to an Inkling install. The email threads were getting ridiculous without a tiny bit of organization. And we didn't need to send them to a project management suite.
Anyways, I love it :) I'm it's best customer.