The iPhone/iTouch input UI can do everything the Macbook trackpad/click-button combo can do and then some. It also opens up a new line of feedback and interaction between the application and the user.

Throw in a Toshiba solid-state disk drive (with capacities up to 128GB in embeddable, 1.8″ and 2.5″ enclosures) and you’ve got another category-changing leap.