I've converted some code we've been using into an extension for importing properly licensed photos from flickr into a Mediawiki installation:

http://www.mediawiki.org/wiki/Extension:ImportFreeImages

It makes use of the phpFlickr package for the API calls.

Feel free to play around with it here:

http://wikidiy.com/mediawiki-1.8.2/index.php/Special:ImportFreeImages

Travis