"The Perfecto Mobile service enables you to control a variety of real mobile handsets over the web. Using the Perfecto Mobile service you can install and test your application on more devices and networks, leading to better quality, shorter time to market, and a bigger target audience."

With the Perfecto Mobile service you can create video clips. Simply create a video clip like this one, of the Betavine Widget, to show what your application can do. Link to this clip from your application's description.
Recently added to the Perfecto Mobile Service

Create video clips to showcase your application. These video clip are created by our video cameras, capturing the actual display of device's screen.
Here is an example of the Betavine Widget: