Wireless network controlled circuit switch

Hi,

I was wondering how easy (or difficult) would be to create a switch/relay that will cut off/turn on power supply to a mains socket or light switch and will be controlled via existing wireless network.
This would have to be equipped with wireless card/chip and be visible through the wireless router as an attached network device.
I know there are already GSM relays on the market but I am interested in WiFi unit.

If you have seen something similiar before please let me know.


Regards,
Pawel

Somewhere I ve seen a device and a circuit that operates in this way. as I remember no need of any netcard but u replace it with something else in the encapsulated circuit. I will try to refound it to be clarified how works

Check hear Texas Instruments Delivers Seamless Wi-Fi Connectivity at Home and On the Go | SYS-CON MEDIA and
here **broken link removed**