Here's an example of the Coverflow widget in a commercial application called PicPush. PicPush is a multimedia syndication application for Android. It allows you to automatically share your pics and videos to Shutterfly, PhotoBucket, SmugMug, Facebook, Gallery, Picasa and Flickr.
It's developed by the guys at 350 Nice. There's some more on how easy they found the integration here. I think they've done a fantastic job, the Coverflow widget looks great!