Apollon is a native KDE file-sharing client:

http://apollon.sourceforge.net/shots.html

Apollon uses the giFT core to connect to various networks, including OpenFT, Gnutella, FastTrack

OpenFT is the homegrown giFT network, Gnutella is the network used by BearShare, LimeWire and others and FastTrack is the popular network used by KaZaA.

It is now available for Knoppix for installation with just a klik - http://klik.berlios.de/