The product isn't exactly new, but I just got in Netgear's Powerline AV Ethernet adapter kit, which promises ethernet connection of up to 200Mbps over your home's powerlines. From early indications, it works a treat, but it does have one major design flaw: As you can see, you can't actually plug it in next to any other device, as it blocks the better part of two plugs on a standard wall socket.
Even having the plug stick out another 5cm so the adapter sits over another powerplug would fix the problem. Fortunately, it seems to work through an extension cord, although I'm certain that would have some kind of effect on performance. I'll let you know how the product performs once I've played with it a bit more.