I'm looking for an add-on or tweak or something that can essentially make my phone act as a USB drive? I see there's PwnTunes, and also one called "USB Drive" in Cydia that claims to be incompatible with iOS4. Does anybody know if either of these work, or of anything else? Even in the App Store? (and I'm looking for one that doesn't require a program downloaded on random computer I'd be at, as most of the App Store ones I've seen require this). I'm running 4.2.1 with redsn0w and greenpois0n on an iPhone 4, btw.