I have Kinoma Play that I have been using for quite a while. It doesn't have all of the same functions that you can get from some of the iPhone aps, but you can add tags, view sets, and basic search.
It sells for $30, which I thought originally was kind of high, but I've got a basic UI for Flickr, Picasa, Facebook, Twitter, YouTube, Audible, Orb, and Box.net.
http://www.kinoma.com/play/