using the native iPhone interface in unity apps is not the most trivial thing from what i have read so far.
i thought i might build a GuiSkin on a relaxed sunday afternoon and post it on the wiki. would apple have any objection?
teehan+lax released a very nice layered .psd a while ago which includes all the iPhoneOS interface-elements
No idea, but I’m sure if you asked Apple, you’d find out soon enough.
There might be existing info on this. Did you check Apple’s developer forums?
Interesting, I’m not sure I see a reason why Apple would object, but then I don’t work for Apple nor am I a lawyer so what do I know? 
Traditionally, Apple has not minded. They don’t want you ripping their logos and skins for something running on Windows, but from my conversations with them it’s always been “sure, shall I try to dig out the source file for you?”
So if it’s for an iPhone game, I’d wager they wouldn’t mind. If somebody uses it to mock up an iphone in a PC standalone, they would probably cease and desist.
re: higgsy nicholas
Yeah that sounds about right 
phoen; what became of this? Think it would be a good Wiki resource if exists.