The guys from CDR-Info compared KaZaA with LimeWire:
We decided to come up with a review which will compare the two topmost peer to peer (p2p) software programs currently available, namely Kazaa (Kz) and Limewire (Lw). These two p2ps have been purchased by literally millions of users worldwide and thus proved to be the most popular and easiest to use so far. Kz has reached version 3.0 and Lw version 4.8.1. Although Kz is more popular than Lw, their history is very much the same.