I really liked this InformationWeek article with Mark Shuttleworth, founder of Ubuntu. I liked it in part because I think Mark is an exceptional person. But I also liked it for its insight into why Ubuntu has done so well.
Hint: It has a lot to do with making a very geeky thing (Linux desktop) less geeky.
IW: Why are you concerned about ease of use when many Linux developers see it as a lesser issue?
Shuttleworth: I'm not brilliant technically like Linux Torvalds. I feel the gaps in Linux usability personally. When you're an exceptional developer, you can be blinded to the ease of use issues. Besides, people gravitate to the problems that they're best equipped to help fix.
That said, Mark is brilliant and quite technical.