Connecting Two PCs Using an USB-USB Cable
Hardware Secrets has released their article on how to connect two PCs using a USB-USB cable. In a day where more and more people have routers to create their own home networks, this method of connecting two PCs is still fairly useful.
If you're getting into the computer repair business, you'll probably want check out this guide. I've personally run into a few occasions where a USB Networking cable was needed.