– Search Youtube
– Display Videos in a Custom (not Youtube) Player.
– Save Videos Offline
– Organize downloaded Videos in categories
– Export downloaded Videos to ordinary AVI files and save them on your machine.
I hope that youtube will make their service more open soon. I think one big point at the moment is that they need to place their ads and such an app prevents this. Maybe they could open the service under the restriction that you display ads from them in your app. Those ads could be updated everytime the app goes online.