Lately a few of my friends have been working on bringing Chinese vocabulary study into the high-tech age. Those projects are not yet complete, but I found an impressive flashcard database site called Flashcard Exchange. It also has a Chinese study section.
The flashcard sets are focused on beginners, with Mandarin vocabulary – Kung Fu (I) apparently the best of them. It’s not actually focused on fung fu (which would be kind of cool), and it’s in simplified characters.