While I have wireless internet in my house, the router is in my basement and the signal strength in the upstairs bedrooms isn't the greatest.  I actually had a second wireless router that I wasn't using and thought, it would be great to set up a second access point in the upstairs bedrooms.  With the help of these ethernet-over-powerline adapters, I was able to accomplish that perfectly.  Basically, you just plug one into your router (or switch depending on where you want it on your network) and a wall outlet.  And then you plug the other one into another wall outlet and viola!  You have an instant network!  It really was that easy.  So I plugged the second one in to the upstairs bedroom and plugged my other wireless router into it.  I had already pre-configured that second wireless router with it's network info and key, etc., so it was just a matter of plugging it in.  I ran a speed test back to my provider (using a wired connection into the second router) and the speed was perfect and although there were some additional hops, the latency was still good.