Both the LCD and GLCD work with 3.3V input signals - the LEDs will be a little dimmer as the PIC sources current to them. As long as the external PIC is powered by its own separate supply (3.3V from the PicKIT2 in my case) and share a common ground, most of the peripherals on the EasyPIC work fine. The EasyPIC is powered by its own on-board 5V supply. I have also tried UART communications between the on-board 5V PIC and the external 3.3V PIC and it works.
Obviously, the external PIC will need to be programmed (and/or debugged) using something like a PicKIT2 (and the appropriate development software). PicFLASH does not support 3.3V only devices. As mentioned previously, this technique allows you to work with other devices such as PIC24/dsPIC33 besides 8-bit PIC's on the EasyPIC. In fact, I have tested this with 32-bit MCU's from NXP and ST as well.
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