SMH published another wifi security article today. It really is very simple to secure your wireless network.
The SMH article is here: Why your wi-fi network is never safe http://www.smh.com.au/digital-life/consumer-security/why-your-wifi-network-is-never-safe-20120424-1xi2m.html?rand=9341044
ISPs are also a bit slack as the main suppliers of the wifi capable modems, without helping people to secure them. This site has some very easy to follow How-To guides showing people how to secure their wifi network using WPA and/or WPA2 (depending on the modem).
This is sooooo easy to do, but many people are just plain scared to get in and try it.