I have blogged about Quizlet before, but here is a new app called Study Blue which lets you do the same things as Quizlet except you can also speak the flash cards instead of just typing them out (as you can see above). Also, it lets the card hang between front and back so you can ponder the answer (it that is any incentive!). You can also add pictures which is important since so many state exams have lots of them. Here is the Android app and the iPhone one. I found out about the app on Mindshift.