Flickr

Content Directory
URL: foo
CC licensed content portal: everything is CC-licensed
CC licensed content feed:
Formats: Template:Format
Approximate size of the CC-licensed collection:

[[Category:Template:Format_Directories]]

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Flickr hosts tens of millions of CC licensed images, accessible via http://flickr.com/creativecommons and http://search.creativecommons.org

Flickr's choose license implementation can be seen at http://flickr.com/account/prefs/license/ (you must be logged in to a Flickr account).

Flickr's implementation is of the drop down menu variety.