Atmel do some nice data books for fpgas, with circuits for programmers. some times in docs as mod's to xxx-programmer.
here is a link to start you off.
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2749Edit: just had a quick look there and I think you need the Atmel Data book for circuit, I think I have a copy in my workshop and will look for it.