A Napster-like add-on to AOL's AIM Instant Messaging system, which uses the Gnutella protocol to enable users to swap MP3s. The Gnutella system is a genuine distributed file protocol which means it is far harder to shut down than Napster's centralised database, but the Aimster authors are hoping to avoid that issue anyway by limiting the number of others with whom users are able to share files. However in this case it could be AOL who get heavy with lawyers, as they have proved themselves in the past to be very proprietary over the AIM protocol.

This was a nodeshell, now it's a writeup.