Microsoft has had control of the domain surface.com since 2007 according to Hosterstats.
I’ve no idea what, if anything, they were doing with it before now, but it’s now being used as the URL in ads for the new Microsoft Surface tablet device:
It’ll redirect you to the product page here
They used it for this:
http://www.microsoft.com/en-us/pixelsense/purchaseprocess.aspx
but it hadn’t won over market by storm so they rebranded it as it is now.
Thanks – I wasn’t aware of it 🙂