Flip phones used to be very common, but today the form factor is not what it used to be. The last really cool flip phone I remember was the Razr back when it was the handset to have. A new Blackberry has leaked that uses the flip form factor.
The device is said to be called the 9670 and it sports a QWERTY keyboard under the flip up screen. I will say that I don't find Blackberry devices particularly appealing style wise, and this is the ugliest of the Blackberry group.
The handset is said to run Blackberry OS 6 and sport a 5MP camera. That display has a resolution of 480 x 360. Maybe it will get better looking before it lands on the market.