Barnes & Noble just announced a new ebook distribution platform called PubIt!. I'm not sure if "distribution" is the right word for it because it appears to be tied to the B&N ebookstore. It's not available until sometime this summer, but they are accepting signups.
Basically this means that B&N is going after the small publishers and the self published in an effort to cut out middlemen (Smashwords, for example).
From the press release:
Barnes & Noble, Inc. (NYSE: BKS), the world’s largest bookseller, is extending its deep and longstanding tradition of supporting authors and publishers with PubIt! by Barnes & Noble, an easy and lucrative way for independent publishers and self-publishing writers to distribute their works digitally through BN.com and the Barnes & Noble eBookstore. The easy-to-use publishing and distribution platform offers qualified independent publishers and authors of self-published works expanded distribution, visibility and protection that only Barnes & Noble can offer.