online collections

I started gathering some links to some good examples of engaging online interfaces to museum, library, historical and organizational collections, and figured it would be handy to post the growing list online as well.

• Science Museum Brought to Life (thanks to a timely tweet by George Siemens)
• Sputnik Observatory - Themes and Paths
• TED Talks - Themes
• Flickr Commons - US Library of Congress, Smithsonian Institution, Galt Museum, Powerhouse Museum
• Glenbow Museum - Mavericks
• SFMOMA - Interactive Features - Frida Kahlo, Making Sense of Modern Art
• Google Books - Public domain collection (eg, Narrative of the Surveying Voyages of His Majesty's Ships Adventure and Beagle)

Any other really good examples of these kinds of collections made available online? Ideally with interfaces that make it possible to view the collections in great detail, to reuse parts of the collection in new works, and/ to integrate with external resources.