Just before christmas we launched a new site for Volvo sweden, where you can search for a used car. The site is a flash front connected to the swedish site bytbil.com backend.
The design might not be spectacular, but if you compare the flow of interaction when searching and tweaking parameters to the native interface of bytbil.com, I believe we did a pretty good job.
Flash-wise, the site is a textbook example of the benefits of using the PureMVC AS3 framework