Skater Dolly Essentials
Check out these videos by P+S Technik, they are very informative about setup and the basics for using these unique type of dollies.
While we are talking about Skater Dollies, I just bought a Omni Tracker Skater Dolly and I love it.
Its really well built, super easy to setup and shoots great shots really quick.
They just came out with a cheaper Slim-Line Pro that is designer for smaller cameras, at only $895 it looks like a sweet deal.