Well after reading through several of the post i'm not sure if Shareaza is going away or not. Seems to be a lot of turmoil in the p2p world. I did however find this link which talks about a lot of the p2p clients. I'm not sure if they're all Linux based or not, but i'm sure some are.
http://www.slyck.com/index.php -- Brad Bendily - CNA
