This is significant because the iPhone SDK is no lean software - the installer (iphone_sdk.dmg) weighs a whooping 2.1 GB and could have an raised bandwidth concerns with so many Apple developers simultaneously downloading the software from all across the globe.
When Microsoft released the second beta of Windows Vista, the demand for that 3.5 GB installer was so huge that it slowed down the Microsoft website and went on to become the largest downloaded software on the Internet.
Coming to iPhone SDK, what constitutes a "download" ?
Apple may be incrementing their download counter as soon as a user initiates the download session - he or she may discontinue downloading the software but that will be still increment the overall download statistics.
John Dowdell of Adobe thinks these are no meaningful stats because only 10% of download attempts actually result in download completions.
Adobe uses an interesting approach to count the number of Flash Player installations - the software pings the Adobe servers when the player is run for the first time after installation so it discounts downloads that were not completed or were successfully completed but not installed by the users.
That definitely sounds a better approach to measure downloads on the Internet.
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