It is my understand that Kazaa/Fastrack switched to central user authentication recently in an attempt to knock out non-licensed clients (like the open source Linux client that can be found on sourceforge). As far as I am concerned this is where they make their mistake as they received a law suit shortly after this switch.

I would hope that Xolox would consider development again after a suitable cooling-off period as I think you have an excellent client.

It may still be true that a truely P2P system like Gnutella is exempt from legal troubles since no copyright material comes into Xolox's possession. The client is a tool and like many tools, it can be used for good or evil. (On the assumption that copyright infringment is "evil". grin.)