An article from Mother Jomes:
The New York Public Library just unleashed 180,000 free images
I searched the collection for royal images Read more...
Where to get free pictures online
Portrait head of Roman emperor Caligula. Source: J. Paul Getty Museum. Digital image courtesy of the Getty's Open Content Program. Read more...
Royals in LIFE, courtesy of Google
Thanks to a tweet from Elizabeth Kerri Mahon of the blog Scandalous Women, I've learned that LIFE Magazine's archives are now available at Google. It appears that just about everything has been scanned, and you can see/read it all for free.
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Anyone can edit anything
World Digital Library
Scheduled to launch on April 21, the World Digital Library "will make available on the Internet, free of charge and in multilingual format, significant primary materials from cultures around the world, including manuscripts, maps, rare books, musical scores, recordings, films, prints, photographs, architectural drawings, and other significant cultural materials."
APRIL 23 UPDATE: Well, the site has launched, and it looks amazingly great. I tested it out with a random search for "Nepal," and found An Account of the Kingdom of Nepal, published in 1811. You can read it on the World Digital Library site for free. How cool is that?