Easy Audio Flash Cards is a fast and free app to create and display audio flash cards (images associated with audio files).
Audio flash cards are a proven method to quickly and easily remember facts and figures, learn a new language, improve your vocabulary and more, and are used in many high end language learning packages.
You can download it from the Android Market here.
Update 4/2012 This is now open source and hosted on GitHub. Check it out at my GitHub page.