Vaccines is an iPhone app that shows immunization schedules recommended by the CDC.
Medical Calculator helps doctors and nurses compute useful formulas and equations on their iPhone.
RSI provides quick access to the rapid sequence intubation procedure on your iPhone.
Sedation provides quick access to procedural sedation and analgesia information on your iPhone.
Path Tracker is an iPhone GPS path tracking app. It's not a medical app, but it's still really cool :)