Basically I would like to port the functionality of the open source application "Fretboard" to the iPhone. "Fretboard" was an application for Palm based handheld computers and the full source is available.
A full description of Fretboard along with screenshots is on this website:
[url removed, login to view]
The user interface has will have to be more modern (all graphics will be provided), but basically the functionality should remain the same.
For a skilled progrmmer this should be a few hours of work, and if you do not want to do it for fun, I'm willing to pay for it.