Configuring a wireless router or modem can sometimes be a little tricky for the average user, so one of the certifications for Vista aimed to take away the pain when setting up your home network and this video from Ben Reed on the Vista Team blog.  Ben shows off how you can setup the router just by entering the pin you get from the manufacturer (in this case D-Link) and then the network map which allows you to see devices on your network.  Also it's worth noting the way he uses a USB pen drive to save wireless settings - this is a great trick for getting devices on your wireless network quickly and easily.