iASL is a video dictionary of 5800+ signs, a custom grammatically correct ASL translator (translates sentences up to 5 words), and conversational phrase book, all rolled into one app!  iPhone/iPod touch: https://itunes.apple.com/app/iasl-translate-english-to/id362030677?ign-mpt=uo%3D4=8 iPad: https://itunes.apple.com/us/app/iasl-translate-english-to/id364176106?mt=8