@Minh:I wondered how long it had been around.  I was over in Seattle a couple of weeks ago and got it in the Belle Vue MS store.  We havn't caught up in the UK yet (at least I havn't seen it over here yet).

Available on Amazon with a healthy discount though: http://www.amazon.co.uk/Microsoft-RVF-00003-Arc-Touch-Mouse/dp/B003XUJ85M/ref=sr_1_1?ie=UTF8&qid=1328730836&sr=8-1