gFlashPro from gWhiz is a Google Spreadsheets poweted mobile flashcards application for iPhone, used by students to study on the go. To create a gFlashPro flashcard set, open up a new spreadsheet and put questions in the first column, and answers (multiple choice) in adjacent columns. Meta-data (set description, search tags, runtime options, and so on) isn't required, but can be entered into a separate worksheet as simple key-value pairs. Then, on the iPhone or iPod touch, from within gFlashPro, users are given a list of the available flashcard sets (i.e., spreadsheets) for easy download. Alternatively, they can select flashcard sets from our catalog: a searchable repository of thousands of shared flashcard sets covering virtually any subject. Once selected, the card set (spreadsheet) is downloaded into gFlashPro and presented to the user for mobile study and quizzing.
More info: App Store
Source:→ Google Mac blog