Tinycards is an app from Duolingo that gives you flashcards for hundreds of topics. We really liked Tinycards when it launched on iPhone last year, and now the tool is available on the web.

StudyBlue is a neat web app that lets you create digital flash cards directly from notes you take in class or anywhere else. You can also take the cards you create just about anywhere with mobile apps for iPhone and Android.

Windows/Mac: Popling is an application that enables you to learn the old-fashioned way with a novel twist, using flashcards on your computer that pop up every few minutes.

If you've been underwhelmed by the flash card and study aid sites you've found online, you'll definitely want to check out Headmagnet. Headmagnet records what you remember and quizzes you in the most efficient way.

Flashcards, a staple of route memorisation and test prep, don't have to take the form of dog-earred 3x5 cards. FlashCardMachine makes it easy to create custom flashcards with a variety of playback methods and media.