This blogger (Blogos— he seems kind of related to me in his play on the word logos) ,  newly discovered this morning via my  Technorati, link  has this post about searching a local library (he’s in Maryland) using a javascript that gets an ISBN number from Amazon. That would be cool to use.  I have often done that (all manually , of course).  Probably not Amazon’s favorite kind of idea,  but I like it.