Sonoff Wifi Switch

I was reading about the Sonoff Wifi Switch on the weekend, which combines an ESP 8266 chip with a relay to give you a very cost-effective network-controllable power switch. The best thing about them is that they are very cheap! I just bought two of these on eBay to evaluate them, so I will post again after they have arrived and I have a chance to test them. Apparently you can flash the 8266 with your own code, so this looks like a great way to get all the components at a cheap price!