The program airsnare lets you detect and monitor strangers accessing your wireless network. The program is freeware with a paypal button for those who like it enough to donate.
Tech TV review:
http://www.techtv.com/screensavers/darktips/story/0,24330,3590348,00.html
Authors download site:
http://home.comcast.net/~jay.deboer/airsnare/
Tech TV review:
http://www.techtv.com/screensavers/darktips/story/0,24330,3590348,00.html
Authors download site:
http://home.comcast.net/~jay.deboer/airsnare/