I came across this interesting thing called FON... It's an interesting concept to allow free WiFi everywhere. I guess its not technically free. You are only allowed to access this WiFi if you also share a portion of your own broadband for other "foneros" as a wireless hotspot. The interesting thing is that there won't be a bunch of free loaders on your router because they can't access your router unless they have there own server as well. As of today, Google is actually a funder of this. This description taken from the FON website might make it a little more clear:
FON is a Global Community of people who share WiFi. Share your WiFi broadband access at home/work and enjoy WiFi all over the world! FON: small cost, great benefit!
To become a Fonero, all you need to do is register with us on our website, have broadband connection, and download the FON Software onto your WiFi router. It's that simple. Just share your connection and the rest of the Community shares back with you. Join FON and enjoy connecting from anywhere within the WiFi World.
To start sharing, set up your access point where you can receive the most coverage, generally close to the window or outside your home. The rest of the Community will be thankful.
Visit the FON site