You may be interested in the app Delicious Library: http://delicious-monster.com/
Edit: Also, Readernaut and Shelfari both offer the sorting features you describe.
Edit: Also, Readernaut and Shelfari both offer the sorting features you describe.
This is not true! I can imagine Apple adding something to FrontRow that acts as a "Virtual Bookshelf." Heck, it doesn't even have to be Apple. Microsoft with that "Project Natal" tech would be able to make an awesome version of this! Just have that up all the time as a sort of screen-saver. Don't limit yourself to just a simulated screenshot of the backs of books. I can imagine something with "cover-flow" and a sidebar of related works. Also, one would have the ability to "magically" re-arrange the books according to whatever indexing/ordering scheme they wanted.
A coffee table sized "Surface" would be ideal for this sort of thing. A "slate" form-factor computer to sit on top of a conventional coffee table would be dandy as well. (Just have it display a different "cover" every 3 seconds in "screen saver" mode.)