I must admit I quite like roundabouts rather than being stuck at lights all the time.
There are a couple of places called the magic roundabout in UK One is in Swindon which some of us are familiar with and the other is in Hemel Hempstead which I drive over on a daily basis.
To be honest they are a good idea in theory but in practice they are a complete nightmare for people who have never driven on them before.
http://www.youtube.com/watch?v=V0yxJsW0wX8The superstreet thing looks good though but no doubt someone will find a way to screw it up.