Macworld is doing an excellent series of articles on Net Neutrality(keeping the internet free from filtering and blocking).
Its a three part series Ive included links to the first two below and will post the last part when they post it. They are focused toward the Mac a little at times but they are a good read and they still apply to Linux and Windows as well.
Part one talks about ISP filtering:
http://www.macworld.com/article/132075/2008/02/netneutrality1.htmlPart Two talks about ways to avoid filtering/blocking:
http://www.macworld.com/article/132101/2008/02/netneutrality2.htmlOn a related note My ISP, Charter, called me about a spike in my bandwidth usage over the last month ( I just love the new iTunes movie rentals

) warning that if it continued any traffic over a set bandwidth limit would be throttled. I told them the second I noticed any change in my service I would be switching ISPs.