Best way to learn key signatures!

The Key quizzes alone make this app worth it. Ive only recently begun learning to read music, and before this app my method of figuring out which key I was in was to count the sharps or flats, then start playing through the circle of 5ths or 4ths until I counted the right number. Now I can tell what key Im in with a glance, thanks to this app.

I dont use it for the clef quizzes as much, because I think it is better to train myself to find the notes on a real piano keyboard. I wonder if there might be a way to hook this app up to midi, so that one could plug a midi keyboard up and take the clef quizzes that way? I think that would make a great update, especially with the new iPhone and iPad midi interfaces that are coming out this year.

boldstandard about ClefTutor - Music Notes Game