Urban Velo has a review/test of the new SRAM Torpedo Fixed / Free hub here, which I guess will interestest plenty of people. Anyhow I'm personally not feeling that at all. I've also never understood the whole flip-flip hub thing anyway. If you ride fixed, ride fixed and if you prefer the freewheel, it's fine but just try to make up your mind please.
And I'm also still much more interested in the Sturmey Archer S3X 3-speed fixed hub.