Apple has confirmed that in excess of 100,000 iPhone developers have downloaded the beta iPhone Software Development Kit (SDK) in the first four days since its launch on March 6.

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

“Developer reaction to the iPhone SDK has been incredible with more than 100,000 downloads in the first four days,” said Phil Schiller, Apple’s senior vice president of worldwide product marketing. Apple also revealed that over one million people have watched the launch video on Apple.com.