Castiv makes guitar and micstand mounts for iPhone, iPod, and iPad. The main product from castiv is the Guitar SideKick.
This allows you to virtually mount your device on a guitar for the purpose of reading sheet music, playing along with music , and more! Guitar SideKick works with any guitar and allows you to convert the headstock into an iPhone/iPod mount. for more information on Castiv or the Guitar Sidekick check out their website at http://www.castiv.com