I will be launching 5 Ubercart 2.0 site this week.

So far I've got:
-a one product store
-a multi product store that sells car parts
-a "song contest" site where people can post submissions and then pay for them. Using custom-price and CA, it marks the submissions as "paid." It even gives discount based on a profile field and number of submissions.
-a video site with a subscription piece using paypal + uc_recurring 2.0dev + paypal WPP patch
-Another car parts site

These are all in final stages of development! All are using UC RC3, and D6.12.