You may also want to have decent information about filesharing in general:
File sharing - Wikipedia, the free encyclopedia Peer-to-peer - Wikipedia, the free encyclopedia File sharing - Wikipedia, the free encyclopedia
And about other clients:
Gnutella - Wikipedia, the free encyclopedia (Comparision of Gnutella clients)
Shareaza - Wikipedia, the free encyclopedia (my preferred P2P application; have a look at the
Shareaza forums; new version will be released during the next 10 days.]
Shareaza - Daily Builds [here you can find current debug builds...]