http://www.azureuswiki.com/index.php/Bad_ISPs
heres a list detailing a small portion of the underhanded things that your isp may be doing to you listed by isp
such as only giving you the full speed you paid for during off peak hours, slowing down your speed if you use a lot of bandwidth, completly blocking p2p downloads/transfers, etc
the list is centered around p2p transfers but it gives some good info








