John Wyver, CEO of Illuminations Media in the UK (they made the filmed versions of Hamlet and Macbeth that aired on PBS last year) has created an online guide to Mosfilm's Youtube Channel. Mosfilm dates back to the early 1920s and this youtube channel includes their full, feature length films. Many with English subtitles. The problem is that the channel itself is in Cyrillic. You can read John's discussions in the form of a three-part guide to what you can find there.
Part 1 http://www.illuminationsmedia.co.uk/blog/index.cfm?start=1&news_id=1049
Part 2 http://www.illuminationsmedia.co.uk/blog/index.cfm?start=1&news_id=1051
Part 3 http://www.illuminationsmedia.co.uk/blog/index.cfm?start=1&news_id=1052
About the National Jukebox
The Library of Congress presents the National Jukebox, which makes historical sound recordings available to the public free of charge. The Jukebox includes recordings from the extraordinary collections of the Library of Congress Packard Campus for Audio Visual Conservation and other contributing libraries and archives.
IMSLP now has a search-by-melody function...
The Visual Arts
Los Angeles County Museum of Art makes their collection available online !
The Museum website is here http://www.lacma.org/
Their digital collection is available here http://www.lacma.org/art/ImageLibrary.aspx
Yale University has done the same thing
Digital Images of Yale’s Vast Cultural Collections Now Available for Free
read about it here
there's a slideshow sampler about halfway down the page.
The link to their frontpage search box is http://discover.odai.yale.edu/ydc/