BitThief - Download bittorrents without uploading anything ;-)

BitThief - "BitThief is a Java-based BitTorrent client designed to download from, but not upload to, BitTorrent networks. It is freeware and cross-platform. According to the BitThief homepage, it is intended as a proof of concept that there are weaknesses in the current BitTorrent protocol, which can be exploited by "cheating" BitTorrent clients (such as BitThief itself)." [wikipedia]

Download:

wget http://dcg.ethz.ch/projects/bitthief/dist/BitThief.jar

Run:

java -jar BitThief.jar                                                                           

;-)