This cellphone with built in projector that you can get in Korea-only. The Show W7900 has a 10-lumen built-in DLP projector. 10 lumens is very low. You really need to have control over the lights to see it clearly. It has a 480×320 resolution projector that uses Texas Instruments' DLP technology.
The phone also has a great looking 3.2-inch, 400 x 240 OLED touch screen, Samsung's widget-based touch OS, and 5MP camera with LED flash. It will be available in Korea soon, but who knows when it will get to the US.
I can see it used in a small presentation where you have control of the lights.