Film: The Real Raw is the latest from Ken Rockwell, much loved (and ranted against) photographer. He has some good points on the longevity of film vs RAW, actually anything digital will not be as long lived as an analog object if for no other reason than something like film doesn't go away if the power is off :) A good read for the photogs out there anyway, taken as always with a grain of salt.
Got raw files shot in 2002 on your then state-of-the-art $5,000 Nikon D1H? Enjoy going back to your 2.7 megapixel files! You may as well delete them now.