Some folks in here have mentioned some interesting stuff about wireless networks. The first most important thing to do is change the wireless router default user name and password. By default it is usually admin, password. Change this first to keep outsiders from making any changes to your router. Then be sure to use a WPA/WEP security key. Make your key as long and complicated as possible(Write it down!). I know it's a hassle to type long character sets, but the more, the better. Disable SSID on your router if possible, this way most everyday users and unexperienced crackers/hackers won't even know your network is there. Use the following programs to seal the deal...Norton Internet Security(Includes Personal Firewall), Spybot S&D(use tea and system timer), or any other preferred software to your liking. Also, my Netgear router has a firewall built in. Good Luck and Happy Virus/Trojan free surfing. P.S. - I have personally secured at least 4 different un-secured wireless networks for my neighbors as they just simply didn't know any better. The best time to seek new wireless networks is around/after Christmas time. I know...the elves forgot to set your security before delivery.
This one tip will help you sleep better tonight
A few seconds are all you need to get a better night's rest.