I've been playing with SRU/SRW output from COPAC and have built this 'wrapper' so I can access stuff locally. Taking an ISBN, it simply returns COPAC data. Two things make its standalone existence worthwhile:
1) - You don't need to know CQL
2) It can dish out the MODs record and holdings as JSON
Its very very untested, but for those that are feeling brave ...
In the bibliographic view we pull data from:
Amazon AWS - editorial reviews and covers
Google Books - read more thing
Öppna bibliotek - reviews (in swedish) from swedish librarians - http://oppnabibliotek.se/ , this will hopefully evolve into a swedish folksonomy project API/database. The second phase of the project is developing a shared tag-database for swedish libraries.
Ad Libris - swedish bookstore