All this talk of blocking kazaa seems a bit crazy to me. Don't you think that someone from Kazaa is reading this list? You certainly know they could. Each time you find a way to block kazaa they can work around your blocking. Instead of the arms race, how about a truce? How about detecting Kazaa packets and marking them as 'high throughput', and then using a bandwidth management algorithm to keep kazaa users happy without making the internet unusable for the rest of us. If you are unlucky enough to have to pay by bytes transferred, then I might suggest that you budget usage. I am sure that the average office worker doesn't use more than 300mb of Internet bandwidth a day, which I voracious p2p user certainly would.
