Free online flashcard making tool. Allows for review in multiple formats, including games. Created by an MIT student, based on high school experiences. Very well developed!
Common file formats will become standard in UK among eInstruction, Hitachi, Luidia, Mimio, PolyVision, Promethean, RM, Sahara Presentation Systems, SMART Technologies, and TeamBoard. Let's hope for similar innovation in US!