The Wii has built-in wireless, so if you have a wireless internet connection or wireless router, you don't need anything additional. If you do not have a wireless connection, you will need to purchase the $25 Nintendo USB LAN adapter that plugs into the USB slot on the Wii system. Then you can just plug in your Ethernet cable into your Wii and off you go. There will be no online games at the launch of the Wii, but Nintendo has promised that they are coming.