As an update to my previous comment, Macintouch got an official comment from Apple regarding the iPhone platform's openness:
"The only two iPhones at the show were under glass, and Apple representatives said it is a "closed platform", refusing even to identify the specific processor it uses, and there's apparently no developer kit for it, though 'developers who want to do applications [for the iPhone] are welcome to contact Apple developer relations.'"
(source: Macintouch front page)
by Paul — Jan 09
"The only two iPhones at the show were under glass, and Apple representatives said it is a "closed platform", refusing even to identify the specific processor it uses, and there's apparently no developer kit for it, though 'developers who want to do applications [for the iPhone] are welcome to contact Apple developer relations.'"
(source: Macintouch front page)