Grant Barrett, co-host of A Way With Words, one of my favourite podcasts, has made his book The Official Dictionary of Unofficial English ($11.21 on Amazon.com) available for download at no cost. You can get it from his Lexicographer's Rules site.
Grant's reasons for giving his book away are interesting:
Since my book The Official Dictionary of Unofficial English is now available on the bootleg e-book sites ("pirate" is the wrong term, I think), I've decided to make it available for download at no cost. [ . . .]
By the way, the way these books get out there is usually simple. Sometimes the files leak from publishers, sometimes from authors, sometimes they're scanned from paper to pixels, etc., etc., Sometimes people pretend to be blind and contact the publisher to ask for a digital copy of a book so they can use it with their screen readers that translate the digital pages into something they can understand. The publisher sends a digital copy and in a few days it's all over the Internet.
COMMENT
It will be interesting to see if Grant's download offer results in increased sales of the hard copy version. I recently read that illegal downloaders of mp3 music buy more CDs than non-downloaders. (I've bought CDs of music I've discovered on Spotify.) Perhaps the same is true for books? After all, I would have thought that there's a much greater incentive to buy a book than there is to buy a CD after downloading the digital version.