Songbook is a simple app that shows and edit Chords and Lyrics in Chord Pro file format.
It's a free application, but donation is appreciated to show your support!
Update:
I'm preparing a page with answers to reviews in the app store, if you're commenting on this app, expecially to remark something that's already said, please point your browser to http://songbook.la-fuffa.com/answer s.html