All networking components have a unique ID also (MAC Addresses), so this feels a bit like scaremongering to me. Developers on any platform can use that relatively safely to presuming individuality, so why's it bothersome that the iPhone has one unqiue ID? (instead of the two MAC addresses (wifi / cellular )
So...if I had somebody else's UDID, what could I do their phone? Scaremongering indeed. <i>yawns</i><p>P.S. Being an owner of an app review blog, I give my UDID out frequently.