Brian designed a CPLD expansion board for the Raspberry Pi. It features a Xilinx XC9572 CPLD, and a i2c buffer connected to Raspberry Pi’s GPIO pins, and I2C port. It is designed to extend R-Pi’s GPIO, and allow for easy solderless bread board prototyping.
CPiLD allows for easy breadboarding with fewer wires as it can reroute pins. It also provides a simple board to learn about logic circuits and hardware description languages.
If enough interest is generated, he will Kickstart this project, and produce it through fulfillment. The schematic is available, and his site mentions the board files will be available as soon as revision 2 of the board is tested.
Via the forum.