You have to remember, Peer Guardian works for more than just Kazaa. It works on several platforms from emule to kazaa. The new kazaa does exactly what Peer Guardian does, but to be safe I would use both, as Kazaa may not update the blocked Ip strings like peer guardian does. With that site above, it is updated every day. I don't know how often it is updated for the kazaa blocking feature.

If you are worried, I'd suggest you to try out filetopia. I've been using it now for 2 days and it works great. I have peer guardian running in the background, and haven't even had 1 scan. Filetopia is like IRC, ICQ, Kazaa, and emule wrapped into one solid nifty application.

It does have some bugs, but with such an overwhelming number of options and features that is to be expected. Give it a shot.