I haven't seen any evidence that the Kazaa people have any interest in developing a mac os x client, but there is a so-called "shadow client" available called Neo , which can be used to download from Kazaa hosts. The downside is that you have to be patient while Neo looks for hosts. If you decide to try it, be sure you read carefully before you get started. You won't get good results unless you follow their instructions, such as clicking on the "master list" button to get the ball rolling on finding hosts.