A long time ago (1999), I had a mobile app called Flash! for Palm OS that I could use to enter multi-line questions and multi-line answers into and then later study them with multiple choice or just flipping the flash card around.

I'm looking for a similar webapp that's compatible with modern mobile browsers (particularly Opera Mini) with these features:
- PDA/phone finger friendly question/answer navigation (using that little 4 way button on the bottom of the PDA)
- Multi-line questions and answers.
- Multiple choice quizzes (which selects answers from other questions at random).
- Non-multiple choice quizzes.