I saw a Yakima ShowBoat last weekend at Canoecopia: it appears to be their version of the Thule Slipstream. The roller bar extends out a little bit over the back of the car so you don't have to go the towel over the roof route. Their site advertises 34" beyond the rear crossbar.
I have the Slipstream and really like it: I've used it on a Subaru Forester and on my current car, a 4 door Golf. I must admit, though, that the ShowBoat looks like a better execution of the concept.
Classic Freestanding Rack
Pull-Up Strap Handle Kit
Heel and Pegpads™
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