isbndb.com is one of several websites that allow you to search for books by isbn, as well as the usual title/author/keyword searching. 

Give it a try:  grab a nearby book (if you are like me, there are quite a few nearby, aren’t there?) and run a few searches.  What you can get is a summary of the book’s content, links to online retailers, and even a general Dewey and LC classification.  No MARC records, unfortunately….

I have used ISBN.nu for several years, and one thing it offers that this new site doesn’t seem to is links to other versions of the book.  I am likely to use both of these sites when searching for book information in the future.

from Karen Coyle, via the OpenLibrary listserv