Blogs and other websites all over the place have linked to this video. The reason is obvious. It shows clearly how cycling infrastructure should be done. It is no accident that Copenhagen and other cities have the levels of cycling that they do. Watch and learn Adelaide:
I should add that Copenhagen is not even the best there is. Some Dutch cities, for instance Groningen and Assen, have a 50% modal share for cycling. Also, as David Hembrow points out, much of Copenhagen's cycle traffic is made up of commuters. Still, compared to where I live in Adelaide, it is cycling heaven.