Web Imaging Sites

The photo imaging sites need to be :

1 - High quality
2 - Free to use : Creative Commons
3 - Free to adapt
4 - Have tags to facilitate search.

Ones I have found
29/10/08 - Flickr - very good. Shall research this more. Delicious.
02/11/08 - Photobucket, ImageShack - search terrible. '1940's car' bought up all car pictures. Webshots - non-period photos. '1940's car' resulted in lots of modern pictures of old cars. Snapfish.