Never heard of the Fusion? It's got another blade on the back. It's double sided. So's the Schick Hydro and the aforementioned Personna. I can understand why the Personna wouldn't really matter, but The Fusion's the best selling razor in the world, so I think that's pretty significant.
The Schick actually doesn't have a back-side blade. The Hydro 5 lube strip pushes back to let the blades get into a tighter space, but still has less maneuverability than the Fusions single back blade.
The Schick Quattro Titanium is the only razor in the Schick line I can think of that has a back trimmer blade. DSC (Dorco) 6 blade also has a model that contains a trimmer blade, as well as the previously mentioned Personna carts.
@turtle - That King of Shaves razor is okay, but the pivot is terrible. Because of the rubber used, it just keeps bending backwards, and you can't really get good pressure against your face with it. It really annoyed me. Also, don't drop it. The mechanism that holds the blade breaks very easily. The blades themselves are either made by Kai or are made using their technology. They also have a new KOS model that you can compare with its counterpart from Kai.