Yes I've got to get one of those things. I only have a station wagon, and need to use my trailer to get my bike around the place. It would be nice to be able to just stick it on the back of the car. We have a lower speed limit for people towing trailers over here (50mph), which isn't the greatest when your car can go quite a bit faster.
Unfortunately the US built racks are pretty expensive with freight and currancy conversion - Aluminium looks like the way to go. I guess I'll have to get my brother to have a go at making one.....