LibraryThing.comAlthough business listings at LibraryThing.com are thin so far (relative to non-business topics), this social networking site is a promising source of ideas for books to investigate as you monitor what published material is available in the training and development field.
All you need to do to gain access to the information compiled by LibraryThing from other users and from sources like the Library of Congress and Amazon is to create a username and password for yourself. If you wish, you can then enter for free up to 200 books in your personal collection in the cataloguing part of the site. Or you can search for books of interest in the lists others have created of their own libraries.
I've found that the most fruitful technique is to search by tags, such as "management," "learning organization," and "negotiation."