Blocking is too obvious. Throw some QoS on the router so that LimeWire
and the like still work, but transfer files so slowly that they are
useless. Did this to a former roommate who was hogging bandwidth with
P2P, worked great.   ;-)

-- 
Andrew S. Zbikowski | http://andy.zibnet.us
IT Outhouse Blog Thing | http://www.itouthouse.com