I setup wireless in my parent’s house today. I actually brought along my Linksys WRT54G from home. It was the one I had flashed with DD-WRT and was using as a bridge.
There are at least a dozen wireless networks visible from their house up on top of a hill. There is an open and unfiltered one close enough to use. There is one for the school across the street. There is free one for [Socal Free Net](http://www.socalfreenet.org/) unusably far in Carmel valley. Half of them are using the default SSIDs: “linksys”, “default”, “NETGEAR”. There does seem to be some correlation between openness and default settings.