This months Perth Linux Users Group talk was from WaFreeNet a networks stretching across most of the Perth metropolitan area. A bunch of wireless enthusiasts have connected point to point links to make a large network separate from their standard Internet connection.
It got me thinking apart from how much fun it looks just for the shear joy of setting up a network it's also great to have other networks like this that don't rely on the Internet. I remember reading about when the Egyptian government cut the national Internet connection that a lot of people started using peer to peer messaging over Bluetooth and mesh WiFi. It's nice to know that if there are Internet problems in Perth whether the intentional or accidental, there are alternative networks out there.