Y'know, I was feeling particularly bold last night, so I gave this a shot. It's not bad at all. The library of content needs to grow a bit to catch up with Kazaa et. al, but the download speeds, search features, and other goodies are pretty nice. It lets you choose which ports it runs on (it runs its own HTTP and HTTPS servers internally) and the privacy options seem good. I don't buy the RIAA hype mentioned above, and what the RIAA is already doing is illegal and will be stopped soon, Verizon lawsuit notwithstanding.

I'd say once word of this program spreads, and once they refine it a little, this will be the dominant P2P sharing app.