I have created & released a fast graphics library for Nokia 6100 LCDs called ArdGrafix6100 under Mozilla Public License v. 2.0. It uses ATmega's SPI peripheral device & block write features of the 6100 LCD controller to boost graphics performance while supporting proportional fonts programmatically & conserving SRAM. You can find the library along with full class documentation & a sample generated using Doxygen at http://code.google.com/p/ardgrafix6100/
The library currently supports the Philips PCF8833 controller & is mainly targeted towards Arduino platforms using the ATmega 168/328 processors (Uno/Nano/Duemilanove etc). Support for the Epson controller & other Arduino platforms like the Mega is planned for future.
I would strongly appreciate help / contributions towards improving /testing the library, adding Epson controller support & porting it to support the Mega