The company announced that it took only four days to reach the round figure. The iPhone SDK was launched on March 6.

“Developer reaction to the iPhone SDK has been incredible […] Also, over one million people have watched the launch video on, further demonstrating the incredible interest developers have in creating applications for the iPhone,” said Philip Schiller, Apple’s senior vice president of Worldwide Product Marketing.

The iPhone SDK provides developers with the same rich set of Application Programming Interfaces (APIs) and tools that Apple uses to create its native applications for iPhone and iPod touch.

The free beta iPhone SDK is available worldwide and can be downloaded from here. The iPhone Developer Program will initially be available only in the US, with Apple planning to expand to other countries in the coming months.