Because NBC, on their Nightly News, had a story about a man who authorities thought that was a Pedophile, when it was his neighbor (Hooked into His Unsecure Wi-Fi Network):

I thought I would write a note about the subject. If you do not have WEP or WPA Security on your Wi-Fi Home Network, your files, broadband Internet access, and life may be up for grabs.

Here is an article on WEP and WPA Security for your home Wi-Fi Network: Webopedia

I prefer using WPA2-SPK.

Here are the links to Netgear (My choice of network Wireless Routers), Belkin & Linksys (As Cisco Company)

Netgear

Belkin

Linksys

Secure or be taken, Jim :-)