Jeromeskee (Massive Monkees) windmills app -- do you have other recommendatiosns for dance apps?

Jerome 'Jeromeskee' Aparis (member of ABDC4's Massive Monkees and of Rocksteady Crew) teaches windmill skills on a new Iphone app. Click here for the review from ISnoops. This is a great use for apps, and there are many more on the Iphone market, but the quality varies. Are there are other recommendations for apps to teach hiphop dance skills?