Apple has published an in-depth video guided tour of Mac OS X 10.5 Leopard, which goes on sale at 6pm 2 October.

The tour supplements the existing written list of 300 new features Apple claims exist in its new OS.

The video features Apple retail employee "John", who talks viewers through the new OS, beginning with its new Finder (with CoverFlow navigation), Stacks and Time Machine.

John also explains new features, such as Safari's built-in translucent PDF controls, which enables users to choose to download a PDF they are viewing with one click.

The tour is also available for download for playback on an iPod or within iTunes. You can watch it here.