Perhaps
the best idea I've ever seen on the web. It offers a
marketlace to
buy and sell used books,
CD's and
DVD's, and as such borrows from places like
Ebay.com, but rather than take bids
online, there are
set prices for purchase.
What really makes this smooth is that Half.com handles the financial transaction and mails the proceeds to the seller.
I recently needed to purchase 'Impro' by Keith Johnstone for an improvisational comedy class I am taking at Unexpected Productions, so made use of their service. Locally, it would have cost me about $20, but I got it from an private seller for about $9.
They also did a publicity stunt that resulted in Half.com, Oregon.
...and while you're in Oregon, if you'd rather visit a bricks and mortar shop, try Powell's City of Books