I've noticed that some games on steam have links on their steam pages to media, for example soundtracks. Examining the shortcuts shows that they point to files residing on some of steam's servers. As example, Dawn of War II has the soundtrack on their page, pointing here:
http://media.steampowered.com/apps/15620/dow2_soundtrack.rar. Another is Greed: Black Borders.
Does anyone know if there is any unpublished (or published) url which has some sort of a listing of all the ancillary media and files available for different games off of Steam?