I visited the new Summer of Love exhibit at the Whitney art museum in NYC yesterday, and the Beatles are featured in several exhibits, be it album covers, psychedelic movies inspired by their songs, or actual photographs of them. The entire exhibit is very worthwhile, but the Beatles art, especially the photographs/drawings, are very unique - even I, dedicated trawler of the Internet for Beatles photos and art, hadn't seen some of the stuff they had there.
So if you're in NYC sometime soon, stop by and take a look. It's a very fab exhibit complete with a lovely music audio tour accompaniment - I really enjoyed the entire thing.
Link To The Online Exhibit:
http://www.whitney.org/www/exhibition/SOL_exhib.jsp