On 7 August 2005, I sold a spare copy of Fred Brook's 'Mythical Man Month' for a few quid on Amazon. It's the only time I used the site to sell anything so naturally, I had quite forgotten that I'd done this.
Today, I received an email from Amazon saying my account was in credit and asking for bank details so they could pay me. Maybe the poor interest they are earning on my banked cash triggered their sudden efficiency. I followed the link provided and discovered that I'd sold the book long, long ago.
So now it occurs to me that I might sell a few more books.