Making a reflector dish to make a wifi antenna directional for more antenna gain. Much better than a pringles can! http://woodgears.ca/misc/wifi_dish.html.
What is Wifi & How Does Wifi Work in Plain English
Wifi antenna booster dish
How to get Free WiFi access anywhere, anytime
How To Setup An Outdoor WiFi Booster
Extend your WIFI with a Beer Can
Como Descobrir Senha WiFi do Vizinho