WiFi

Activate Your Wireless Security Settings
If you are running a wireless network and haven't changed the default user name and password, or set it up to use encryption, take a few minutes to do that. If you're not sure how to do these things, THIS SITE has some easy-to-follow video and text primers on four of the most widely used wireless routers on the market.

Xirrus Wi-Fi Monitor Detects Wireless Networks
Free application Xirrus Wi-Fi Monitor is a cross-platform Wi-Fi tool that displays available networks on a very cool radar map. More specifically, the app searches for Wi-Fi networks, displays strength, detects rogue access points, and helps you tweak your network for the best signal. The downside: Xirrus Wi-Fi monitor is only available in widget/gadget/desklet form.