Within limits:
Wait for the Leopard Mac OS X 10.5 Leopard release later this month before you write off the iPhone platform. Apple hasn’t shipped an SDK yet, not because Apple is evil, but because the iPhone is a Leopard device. Blackfriars’ Marketing writes.
AppleInsider: Apple’s new iPhone, which isn’t due to begin shipping until June, runs a version of the company’s Mac OS X 10.5 “Leopard” operating system slated to ship around the same time, a published report said Thursday. More …
This makes more sense of the delay of Mac OS X 10.5 due to iPhone.