Medical Educator is a iOS app by the Medical Educator Team that is designed to help medical students in the UK pass medical student exams.
Obviously, medical students in the UK would be the primary audience for this app, but it still has utility in the US due to the excellent collection of videos in the app - procedures, physical exams, and more.
Some of the jargon/terminology in the app and the promotional material is foreign ("...doctors of SPR grade and above....."), but it is a well organized app that is easy to use.
This app is something for any medical student to download and try out.
Medical Educator for iOS is available for free at the iTunes App Store.