http://www.flipcode.com/cgi-bin/msg.cgi?showThread=05-10-2002&forum=iotd&id=-1
This thing is awsome. Watch it while your downloading something for nonstop fun.
Edit:
Working link to file
http://mavra.perilith.com/~io/hackerpacket.zip
Can't find PacketGetVersion in packet.dll?
edit: Ah, updated winpcap and now it works.