I took a seminar/class with Cheri Erdman many years ago (probably 1998 or so) and it was really the first major stepping stone toward size-esteem and fat acceptance for me. I also recommend Ragan Chastain. She's a professional dancer and blogger (her blog is called "Dances with Fat.") She has a book called FAT; The Owners' Manual, sold on her website on a pay-what-you-want basis. There were a ton of typos, but the ideas within were provocative.