I must tell you that I find the navigation animation to be very distracting. I think you'd be better off without it at all. Otherwise, appears to be an nice service.
I'd also add a "How Does it Work" section to the site.
Thanks, I'll reduce the number of effects going on. :)
I think you could mitigate some of the irritation by greatly increasing the movement speed of the highlight, and somehow fixing the snap-back that occurs when you move to the right of the bar.