Ping’s reputation has a putter manufacturer is certainly already made. When they decided to launch an iPhone App to help golfers improve their putting, they certainly thought about it twice and tested it thoroughly before releasing it! And here we are, enjoying the iPing Putting App. Install the Ping cradle on your putter, slide your iPhone or iPod Touch in the cradle and start putting. The app will record your impact angle, your stroke rotation, and the tempo of your stroke and give you pointers on how to improve.
Smart move from Ping: the App itself is free but you will need to purchase a cradle for $30 to be able to use the app. A cool feature on the iPing App is the ability to share and compare your putting data with friends and pro golfers.
Here is an introductory video: