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Agile Partners’ GuitarToolkit (iTunes Link) provides a bundle of guitary goodness all wrapped up in the Appley goodness of your iPhone.

First off there’s a tuner. Using the built-in microphone on your iPhone, you can use the GuitarToolkit’s chromatic tuner to sort yourself out. Alternate tunings aren’t an issue and you can even create your own if whatever weird one you’re using isn’t available.
Potentially more useful for guitarists to carry around in their pockets, however, is the scale and chord library. There’s half a million chords squeezed into this thing.
You can …