The Kazaa client for Linux has been discontinued.
Kazaa sucks, it's windows only now, it is the primary target of the RIAA, the network is poisoned with bogus files, the quality of the files you download is shite, and I could go on like this for a while ....
Besides, I don't like the idea of downloading and sharing hundreds of files, promoting piracy and stuff like that.
Use it to see if you like songs you don't know yet and if you like them buy the cd