Computers used to be for geeks. And geeks were fine with dealing with a difficult and finicky interface--they liked this--it was even a sort of badge of honor (e.g. the Unix geeks). But making the interface really intuitive and useful--think about the first Macintosh computers--took computers far far beyond the geek crowd. The Mac made HCI (human computer interaction) and usability very popular topics in the productivity software industry. Suddenly a new kind of experience was crucial to the success of software - the user experience. Now, 20 years later, developers are applying and extending...