Evaluation board Links
Here are a few links I have found that may be of interest. If you know of any more that you think should be here, please let me know.
Xilinx Spartan 3E starter kit
A great starting point for building an FPGA based synth
Build your own FPGA starter kit. Details/schematics and gerbers for a Spartan2 dveleopment board (200k gate)
Burch electronic designs
a great looking board with plenty of extras you can buy to simply plug in, and a good price.
a good range of boards and fpga/cpld types.