From: eLinux.org
Technologic Systems ( http://www.embeddedarm.com) offers some nice boards that are usable as development boards but also as OEM modules to integrate into your products.
Especially the TS-7300 is a very nice board build around the Cirrus Logic EP9312 SoC to experiment with FPGA technology. This board contains a completely unoccupied FPGA that can be programmed from the main CPU.