There's no replacement for an actual doctor when you're on the verge of death, but if you find yourself without in the midst of an emergency, the S.O.S. app might help. Come on, it's powered by Oprah's favourite doc!
S.O.S. uses the knowhow of the Red Cross and the suave bedside manner of Dr Oz to guide you through over 30 emergency procedures - CPR, choking, those sorts of things. Some of the instructions come with more advanced information, like a chest-pump timer for CPR.
The app's free, and it might even slightly increase the chances of someone not dying. Kind of a no-brainer. [Android Market]