iPhone SDK downloads surpass 100,000

“Developer reaction to the iPhone SDK has been incredible with more than 100,000 downloads in the first four days,” said Philip Schiller, Apple’s senior vice president of Worldwide Product Marketing. “Also, over one million people have watched the launch video on Apple.com, further demonstrating the incredible interest developers have in creating applications for the iPhone.”

It's pretty obvious that the iPhone SDK is a really big deal, right?

Could Apple have been planning an SDK all along? Or were they coerced into doing it by the crafty cottage industry of jailbreakers that's grown around iPhone? Or in an attempt to goose waning sales after the inevitable plateau? Anyone seen the AAPL stock price lately? Conspiracy?

Other SDK items of note: Apple's iPhone Human Interface Guidelines, Rogue Amoeba's SDK bug report, third-party iPhone apps won't run in the background and Apple's taking a 30 percent cut of sales. (Jon Gruber has been covering SDK like a madman.)

For more on the SDK launch event where AOL, Electronic Arts, Epocrates, Salesforce.com and Sega have demonstrated their wares read David Morgenstern's Reporter's Notebook.