This new anti-Amazon open letter has an impressive list of signators:
http://authorsunited.net/
P.S. Is the length of the signator list, or the number of prominent authors on it, a reason to side with Hachette? Of course not. Just as the number of prominent posters here, with contrasting opinions, is no reason to side with Amazon
P.P.S. Googling some more, the letter mostly is the same as one from July; they just have more signators now, and plan to advertise the text:
http://www.publishersweekly.com/pw/b...to-amazon.html