I've been impressed by this app so far. It is a great way to find people who are following and unfollowing you on Twitter, as well as find new people to follow. I believe it was posted by @mijustin under its old brand a while back: http://www.producthunt.com/posts...

@Dylan, I found the App very useful as well. You can see those that unfollowed you in real live life and you can then decide, either to unfollow them or continue to follow them.