Wireless War driving.
Walk or drive around your neighborhood, preferably with a friend, and find out how many wireless access points you can find. Please try one block in each direction. Please note the following:
Total number of WIFI stations found How many open unsecured ones How many secured What kind of security were they using Any other information. For example, if you have a Windows 7 you can get details about the type of security or encryption such as AES.