Just in case user's started to get sued by the RIAA's actions---What if a software (kazaa/kazaaLite) were to turn the tables on how the whole process of file sharing works???
What if a list of file "requests" from users were stored and allowed other users to see this list. If the user had this file, he/she would then allow that person to download...and so on. This would be in order recieved as requests came in and only if you are currently online would requests remain in the datbase to be viewed and allowed download.
Thus, eliminating an open "shared" folder for the prying eyes of the music industry folk, etc. Nobody would know what anyone had on their harddrives