A user can send a song from Cherrypeel to any friend (on their wall or in a private message) and they can vote on the song directly in facebook. They don't need to sign up for the app to listen to the song but will need to sign up tosend the app on to another friend. http://apps.facebook.com/cherrypeel/
we were thinking about that to get it out in time for Christmas. Do you think these apps would help us gain traffic or just give our existing users another way to interact with the site?
We have started to focus on that, trying to get people more involved and giving them reasons to come back to the site. It is a weakness of ours at this point but something that is solvable.