If I were Apple, I'd be worried about this. Two lifelong Mac fans are switching away from Macs to PCs running Ubuntu Linux. If I were Apple, I'd be worried about this. Two lifelong Mac fans are switching away from Macs to PCs running Ubuntu Linux: first it was Mark Pilgrim and now Cory Doctorow. Nerds are a small demographic, but they can also be the canary in the coal mine with stuff like this.
Update: Tim O'Reilly muses on the Ubuntu switchings. [kottke.org remaindered links]