Ever wonder how much the Mac’s user interface has changed over time? Thanks to Stephen Hackett’s extensive collection of screenshots in each of the 15 versions of the Mac operating system, we can all trace the transition from Pin Stripes to Brushed Metal and relive the skeuomorphic excess of Rich Corinthian Leather.

Are contemporary computing interfaces making us crazy? Fast Company's Mark Wilson finds inner peace in the interface of the Mac operating system circa 1991.

Gmail, Google’s popular email service, has undergone a revamp that includes visual tweaks and a battery of new features, some focused on usability, others on security.