Linux only: Free IP-filtering application IPlist protects your BitTorrent downloads from third-party snoopers and blockers by controlling which IP addresses can and cannot connect to your system. The default blacklist installed with IPlist is a pretty good start to protecting your torrent privacy, and an “Update” button adds the latest known addresses with bad juju behind them, but the app also lets you add ranges, specific addresses, and other kinds of traffic to allow and block. Simply fire up IPlist before running your BitTorrent client, and the app will do its work. IPlist is a free download for Linux systems; hit the link below for prerequisites and installation help with Debian/Ubuntu and Fedora systems.
[Via LifeHacker]
Thought people who like to download stuff would like to know how to protect yourself. Enjoy, Hopefully I can find something much better for Windows down the road!!