Almost any P2P program is going to have to broadcast "I have this file" and "I'm at this address, call me."
So there you go. It could be written that all P2P is spyware. But then again once I tell you what it does, is it spyware?
It seems the latest trend is for antispyware programs to identify file sharing programs as spyware. Do they actually send information about you over the Internet without your knowledge?