I was looking into these a while back.
The website is
http://www.reevu.com/ The company told me that they are currently only available from one stockist in Newcastle
http://www.customlids.co.uk/helmets/reevu/reevu.htm but that they would be more widely available in 2006.
For those that have tried it, what was the problem? Was the rear-vision too intrusive or that the image moved around with your head?
oh, and happy new year to all!