The International ISMN Agency just published a brochure explaining the benefits and options of applications the International Standard Music number offers music publishers, music trade, rights organizations and libraries:

ISMN. International Standard Music Number.

Berlin 2012, 48 pages. ISBN 978-92-990051-4-9.

Contents:

- ISMN: ismn story, ismn benefits, ismn applications, ismn beneficiaries
- Music publisher: tracking, communication, interoperability, automation
- Music trade: tracking, data management, ordering and sales, information exchange
- Rights organization: metadata, tracking, copyright, royalty payments
- Library: legal deposits, acquisition, library catalogues
- Standards: understanding, administration, ismn and isbn

A copy can be downloaded here