is there a kazaa for linux ? or a kazaa network client or even any network like the kazaaz(p2p file sharing) ?

you can get "kazaa" through a couple of tricks :
1. use mldonkey (www.mldonkey.org) it supports alot of networks including fasttrack (=kazaa).
2. user gift+fasttrack plugin+a gui ( http://gift.sourceforge.net - https://developer.berlios.de/projects/gift-fasttrack/
- http://apollon.sourceforge.net )
3. run kazaa through wine (there's very detailed tutorial on how to do it on http://forums.gentoo.org )

peace