Neil Gaiman's publisher HarperCollins have given him the green light to do a free (as in beer) web-release of one of his books and Neil's running a poll to see which one he should put online -- go vote! They'll leave it up for a month and track sales -- if the experiment succeeds, they'll do more.
http://www.boingboing.net/2008/02/09/which-book-should-ne.html