‘A textbook author in Toronto made enough money from his calculus textbook to afford a $20 million house’

Seth Godin’s instant classic post about the obsolescence of textbooks:

They’re out of date and don’t match the course. The 2009-2010 edition of the MKTG textbook, which is the hippest I could find, has no entries in the index for Google, Twitter, or even Permission Marketing.

In a world of wikipedia, where every definition is a click away, it’s foolish to give me definitions to memorize. (…)

This industry deserves to die.

It really struck a nerve, as you can see from his update.