There is the new Barnes & Noble PubIt platform just detailed [1] for digital self-publishing. Royalties are 65% for the $2.99-$9.99 range and 40% for $10.00 <= prices <= $2.98. Supposedly with "no additional charges, regardless of file size" and "no hidden terms or fees".
[1]: http://www.engadget.com/2010/10/04/barnes-and-noble-opens-pu...