I have one of these: http://www.sparkfun.com/products/8600
I have supplied it 3.3V from an external power supply (to VBATT and 3.3v) and tried CS, SCK, DIO and Reset both straight from the Arduino and with voltage dividers (Some documentation suggested this was a simple case of doing Arduino->680 Ohm Resistor->T-off to display->680 Ohm Resistor->GND)
I'm using the Color LCD Shield library and connecting the pins up the same as the shield (CS=8, RESET=9,DIO=11,SCK=13), my screen had a red tag on it, so I'm led to believe it is an Epson unit, however I have tried the Phillips argument as well.
I cannot get it to fire up - the backlight lights up when supplied with 3.3v from a decent supply, but that is all that seems to happen.
If it makes any odds, I am using a Mega.