From the New York Times:

Online Sales of Used Books Draw Protest. Authors are rebelling against new efforts by Amazon.com to spur sales of used books, a practice that has become a major source of revenue for Amazon but pays nothing to writers or publishers. By David D. Kirkpatrick.

I'm curious. Do used bookstores sell newer used books? What about them? All Amazon is doing is making it easier for people to find used books. This is similar to the whole argument about used CDs.