Apple announced that the iPhone SDK has already been downloaded 100,000 times. If the SDK is for sure a success among developers, one should not forget that many Mac users got their copy of the SDK simply to test it or watch the package made available by Cupertino.
To get a better idea of the iPhone SDK success, one will have to wait for June and/or the WWDC to quickly evaluate how many iPhone applications have been developed, as well as how many developers agreed to pay 100USD to get the coding key allowing the have their application available from the AppStore.
[translation by Linathael]