I think the biggest thing you are all over looking is the fact that nothing is as anonymous as you all seem to think you are. Everytime you download something you are putting yourself at risk. I know most people think that they will never be caught, but the truth is, everything you download is logged at some point and time, so everything you do is known.
Usenet is however safer in the aspect that you are not sharing your IP with a pool of peers, but it is logged at both the usenet server and your ISP. So rather than being caught in a swarn like bittorrent does, you still have to worry about either your ISP, or the usenet server being subpeona'd for a list of IP addy's.
Just thought that should be known... :lookaroun