The QR suggestion is excellent.. though just think about getting that through the App Store Approval process... most likely it will be rejected, especially since official app store apps are DRM protected, this would likely violate the open source license. See the case of VLC for iPhone = http://www.tipb.com/2011/01/08/vlc-officially-pulled-app-store/

Most likely you will have to submit as a jailbreak app.. in which case, evaluate if there are actually enough users to justify the project.