Hi there, I'm one of the 4 folks working on spicyelephant and in answer to your questions:
1. We would not like to limit people to purely textual content, as it stands now you are able to include images in both questions and answers. Further to that, it would be hard to rate a person's recall based purely on whether they got the answer right (e.g. it could have been a random guess)
2. Could you elaborate on where you were failing to see the answers, because answers should definitely appear when studying.
3. Definitely something we can address, thanks for raising it.
4. The real gist of the application isn't in the electronic representation of flash cards, but the algorithm behind it that keeps track of how well you're recalling the answers and then let's you know when the best time is to study again. This studying methodology is known as spaced repetition (http://en.wikipedia.org/wiki/Spaced_repetition)
Again, thank you and everyone else who has taken the time to take a look and comment, your feedback and suggestions are all greatly appreciated.