I have found the greatest tool ever for my block swap:
http://nixiechicks.com/index.php?cPath=37
quick and easy block reference tool, gives patterns for about 100 blocks and the rotary cutting directions for 5 sizes of blocks
go to nixie chicks and check out their 99 cent fat quarters too!
Sharon and her mom run this little store and give fantastic service. She doesn't carry a lot of stock, but it changes daily and sells fast because of her cheap prices.