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Make of this what you will, but Microsoft is set to release Windows Vista, the successor to XP, in the second half of this year and the first look at Leopard, OS X 10.5, will be overdue by then. Apple said last year that Leopard would be released late 2006 or early 2007.

It is two years since Apple CEO Steve Jobs introduced Tiger at WWDC, the third major upgrade in the three years since the release of OS X 10.0. Shortly before Jobs took the wraps off new features such as Spotlight and Dashboard, Apple's chief software technology officer, Avie Tevanian, said that one new version per year was not sustainable, and so it has proved.

For more information on WWDC 2006 go to developer.apple.com/wwdc.