Ringflash adapter for Canon 580ex and Nikon SB-800

One of the more interesting things I saw at Photofest Ireland, was a new Ringflash adaptor for the Canon 580ex (SB-800 due out soon).

Created by a Czech photographer, it uses prisms and mirrors to get an even distibution of light around the ring.
It looked very cool. As I'm using a 550ex and the Sigma 500 Super, I enquired about these flashes. Apparently some 550ex users have cut slits in the sides and this has worked for them.
More information at Flaghead, Robert White and Warehouse Express in England. Barker Photographic are the Irish Distributers.