Fanatics will remember that the logo was introduced with the Apple II in 1977. Rob talks about this and other insights into the design's history, like the fact that he originally presented only two versions of the logo to the Steves (Jobs and Wozniak): One with and one without the "bite." Other tidbits include why the original design had stripes and what the bite really represents. It's an interview worth reading.
Rob has been interviewed many times before, naturally -- see these past conversations for more insight.