Got a new miniature dolly today. It's the Revolve Camera dolly. It's actually a Kickstarter project.
The dolly is exceptionally well machined. I haven't put it on rails but within a couple minutes of opening the box I was able to do this with my iPod Touch (yep, I made some tall video. Get over it.)
I have all sorts of plans in mind for the dragon movie and this dolly.