Block Bit Torrent traffic with IPTABLES

I came across these two posts

http://www.md3v.com/blocking-bittorrent

and

http://serverfault.com/questions/27088/using-linux-iptables-how-to-block-torrents-or-any-p2p-protocols

Whats interesting is that both use different algorithms  (http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm vs http://en.wikipedia.org/wiki/Knuth%E2%80%93Morris%E2%80%93Pratt_algorithm )

HTH

Brent