[Sigia-l] Official identifiers for media

[Peter Van Dijck]

Hi all,
Ourmedia.org is an open repository for media by the people. I am helping 
them out a little bit with their IA.

We need a list of "official identifiers" for various types of media 
(video, audio, text, ...).

ISBN is a good example for text (http://www.isbn.org). Could you help me 
with others? We need this finalized by Sunday. Ourmedia.org is a great 
project, they work together with Creative Commons and the Internet 
Archive :) Thanks for any help on this!

Peter