NinjaKido on 01 February 2009
http://www.amazon.co.uk/Xbox-360-Wireless-Headset/dp/B000HKD6EK/ref=sr_1_2?ie=UTF8&s=electronics&qid=1233499621&sr=1-2
It doesn't say official but they look it , I don't have a 360 but my friend uses that.