I was at an event this evening where the new RoundTail frame was unveiled - apparently it was designed by one of the cyclists in our community.
I'm not sure I'm sold on the concept, but I thought it was pretty cool that it came from a guy in Windsor!
I don't know how to paste pictures, but check it out at the link: http://www.gizmag.com/roundtail-bike-replaces-rear-triangle-with-rings/18388/
Cool idea but not UCI legal (if that matters to you)...reminds me of softride bikes for some reason, not the appearance but the whole radical idea.