I was thinking yesterday about how cool it would be to have a little Quisition client for the Apple iPhone so you can review your flashcards while standing in a line or catching public transport, etc.
But then I thought, what if Apple really doesn't allow 3rd party applications on the iPhone?
Then I realised: it does allow 3rd party apps. They are called the Web.
UPDATE: The same point is made by Jonathan LaCour and Mark Baker