On the agile testing mail group, Brian Marick posted that his book Everday Scripting with Ruby had good sales the first year then low sales this and wondered if it was because the audience for it was saturated
I bought it when it came out and found it a great read - as a totally unscientific experiment, who else out there has it - or has heard of it but not bought it ?
I've got it and read 2 chapters, unfortunately I've not had chance to spend any more time with it, so I'm ashamed to say it's currently sitting gathering dust.