The App Store is like the weather. Everybody complains about it but nobody does anything about it. The store is still full of junk apps and people still buy them. But every once in a while you come across an app that is worthwhile and in this case, could actually save lives.
PocketCPR is such an app. While labeled for "TRAINING USE ONLY" and I'm sure some lawyers would have something to say about it, the idea is to guide you through Cardiopulmonary Resuscitation in an emergency. The app leverages the accelerometer to determine how well you are performing and give you audible and visual advice if you need to go faster or slower.
You can hold the device in your hands while performing CPR, or ideally, use a special case designed to wrap around your hand. The developer's main line of business (ZOLL Medical Corporation) is commercial CPR machines so this is a logical extension and at just $0.99, PocketCPR deserves a spot on your home page. I talked with the developer and he would like to see the app on every iPhone and I agree. Perhaps a free version, with a healthcare-related sponsor like Johnson & Johnson could make that happen? Until then, $0.99 is a small price to pay for peace of mind.
Like insurance, I hope you never have to use PocketCPR, but if you do indeed need it one day, you'll be glad you have it.