I just looked at the iREAL BOOK app ... editable chords, transposable, downloadable ... you can see where it's going. PG needs to get something out there, stat, or my name isn't John Birks Gillespie. There are many more BiaB charts available right now, but these guys will catch up. At $1 a pop, an editable viewer like that should easily pay for itself (in development cost) in a few months or less.