There was a very interesting issue on Future Tense on public radio a few months ago (just catching up with listening to my pod-casts). Should computers learn how to forget? (The May 8th entry of Future Tense at http://www.publicradio.org/columns/futuretense/2007/05/index.shtml)To quote from Future Tense:
Some very interesting issues to think about.
Harvard public policy professor Viktor Mayer-Shoenberger believes our digitally-fueled culture remembers too much for too long. He's suggesting that we learn how to forget again."
Schonberger has just published a paper called "Useful Void: The Art of Forgetting in the Age of Ubiquitous Computing."