The touchpad on the back of the screen is... well, interesting, but that's about all we can really say about it at this point -- as Sanjay said during the keynote, it'll be up to devs utilizing Moto's API to do the really awesome stuff with it. In the meantime, it acts exactly as you'd expect a trackball or optical pad to work on Android -- just upside down.
In terms of the screen and the Blur experience, it's a dead ringer for the CLIQ, for better or worse -- the big difference, of course, is the fact that the screen can be tilted. The phone's got a sensor so it can detect when the screen's at a 45-degree angle, putting it in a media mode and making it particularly useful as an alarm clock. Would we buy one? We're not sure -- it's no Droid, certainly -- but maybe it doesn't have to be. Check some raw video after the break!
Motorola Backflip hands-on