After introducing the multitouch user interface in the iPhone and iPodTouch, and then in the MacBook Air Apple has now introduced it across the MacBook and MacBook Pro lines.Interestingly, this means that the desktop machines don’t have multitouch, which given it will no doubt be more widely adopted by developers as SDK’s for it become available, which may leave desktop users in the lurch. The obvious move would be for Apple to incorporate multitouch in the screens it manufacturers. However this answer would probably be a bad solution given the problem of gorilla arm. Perhaps a multitouch pad built into keyboards? A third party Kensington multitouch USB trackpad? Then again the MacBooks already use a different input method to mice, however it’s not clear how easily the rotational gestures would map to a mouse (scrolling and zooming is already usually mapped to the scroll wheel/ball). Mouse with a knob?Or perhaps Apple has an even more revolutionary input device up its sleeve…