The Rollei version of the HY6, and a few other goodies:

Courtesy of one of my favourite shops in Paris.

 

Is that the one you can change the backs on? Sounds interesting, though I must say I do like the look of the twin lens....

 

Have a look at Michael Reichmann’s Photokina 2006 - 5 min - VideoBlog #5 Medium Format

 

There's also a Leaf version!