the author of this app says:
LearnFlash, learn fast! This is the fastest way to build your vocabulary. Just use your PalmPilot!
Study for standard tests (such as the SAT or GRE), learn terms at the sushi bar, become a wine-tasting connoisseur, or even learn about the stock market.
More than 1,400 words are available in the registered version, with more to come.