Read about this in Bicycling magazine

[sandy]

http://www.youtube.com/watch?v=yOz83lsNqqw&feature=related

[Funhog]

It's got a pretty price tag - I think about $2,000! Frank from my LBS tried it at Interbike and said it was the most sublime shifting experience he's ever had on a bike!

drool....

[megale3]

Loved how fast it shifted. Just need to see what it does on a 12 % in the middle to large cog rapid shift. I know that if the Tour guys have used it that it must be somewhat stable feeling and just to think that there will never be a spoke and dérailleur collision sounds great to me:cool:

[SpinBob]

Here's an article in Wired magazine:
http://www.wired.com/gadgets/miscellaneous/news/2008/07/shimano