@jasonkchapman It's interesting, apparently before 1991 there was no mention of digital rights in contracts, so a lot of that has to be renegotiated. Open Road Media, ex-Harper CEO Jane Friedman's new company, is taking advantage of this and basing her epublishing-centric house on this, obtaining rights and rereleasing digital backlist.
http://www.nytimes.com/2009/10/14/books/14fried.html
They plan to release 750-1000 books in their first year. Crazy.