Before installing and developing with the sixth beta version of the iPhone SDK, you must first upgrade your Mac system to Mac OS X v10.5.3. To upgrade your Mac, go to System Preferences and select Software Update to install the latest version.
During Apple’s Q2 08 conference call on April 23, CFO Peter Oppenheimer said that the SDK had already been downloaded 200,000 times and was already being used in one-third of the Fortune 500 companies to develop applications for the iPhone/iPod touch.
More info and download link here.
iPhone SDK Release Notes for Beta 6 can be found here.
[Thanks to MacDailyNews Reader “Mike in Helsinki” for the heads up.]