I watched the Apple WWDC Keynote video stream last week, and have been following the reactions online about features demonstrated for the next version of Mac OS X, 10.5 (“Leopard”). A lot of people (especially non-Mac users) have commented that features like Spaces and even Time Machine have already been done on other operating systems, or as third-party utilities for OS X. They’re missing the point. What’s great about these new features in Leopard is their accessibility to normal people, i.e., their simple interfaces.