New feature: Bookstore inventory search

[Joao Prado Maia]

Just a little note that my little app at the URL below now provides
bookstore inventory search:

http://impleo.net/bookstores/

All you need to know is your zip code and the ISBN of the book you are
looking for.

Unfortunately it is only searching on Barnes & Noble right now, but
I'm trying to find ways to search the inventory of other bookstores.
If anyone knows of any other bookstore that supports this, please let
me know.

Hope you find it useful.

--Joao