Suggestions for Pitch Tracking Application

[Sweet Pitch 96]

My dh is a software developer and is in the process of developing a pitch tracking application for Android phones and eventually i-pod/i-phone. Any suggestions as to what you would like and what you wouldn't like would be helpful. If this works out, he wants to develop a full scorebook app for both Android and i-pod/i-phone. He thinks i-score could be better.

For the pitch tracker, what information would you like to track? What options would you like to have? What would just be something "cool" to have as part of the app? What drives you crazy about current scoring applications?

Thanks for your help.