heh, ettercap is downright scary. i used that once in school monitoring my school network (it works for both wired and wireless lans), and it wasn;t really a good thing to see people's passwords (those who were telnet'ing) flying by.
the most surprised were the IM users, whose conversations would show up as they type - they were impressed, but not amused. lol.
no, i wasnt snooping into anyones' biz.