-- 64-bit processor support throughout the operating system, including the ability to run 32- and 64-bit applications side by side.

-- Time Machine, a continuously running backup application that allows users to maintain a backup of every file on their computer -- either on a second hard drive or a server. Time Machine also allows users to go backwards and forwards in time to locate specific versions of files that have been changed or deleted and sports an impressive user interface. As with Spotlight, developers will be able to integrate Time Machine into applications.

-- A complete package approach that includes a final release of Boot Camp for running Windows in a dual-boot system (Apple will not include virtualization in Mac OS X, leaving that for other developers such as Parallels to provide) and significantly enhanced Front Row and Photo Booth updates.

-- Virtual Desktops called Spaces that allow users to place similar applications and open files in separately defined areas that promote ease of workflow. Drag-and-drop and Dock support will be included in Spaces.

-- Improved Spotlight searching, which will allow searching of remote computers and servers, as well as advanced search options.