here is a peek into Mary Jo Hiney's book of fabric folding and some instructions too :D
http://books.google.com/books?hl=en&id=l2tzUJjpGHgC&dq=The%2Bart%2Bof%2Bfo lding%2Bfabric&printsec=frontcover&source=web&ots= FuRM721JdN&sig=WbuIah2eT8xKEPpzLyn7C6Y7AWI#PPA23,M 1