Amazon has begun offering Mac OS X 10.5 (Leopard) for pre-ordering on their website.

Amazon first offered Leopard for presale on June 12th, a day after Apple’s WWDC keynote announcing Leopard’s new features. Leopard is now ranked #2 amongst best selling software.

Mac OS X 10.5 Leopard is scheduled to ship in October 2007.

Source : Amazon