I read and loved "The Womanly Art of Breastfeeding". It was a great book. Try to get an updated copy though.
I agree with PP. Try to find a LLL group in your area. There is SO much BAD information out there, and it often comes from people who you think should know about BFing. I just came home from DS's 9 month appointment and my doctor assumed I must have weaned DS because he has 8 teeth! And then she went on about night weaning him so that he can sleep through the night!! My BFF just had her first last week and was advised by her doctor that she should only nurse every 3 hours so her supply would keep up!
Ok, sorry, that's my rant. I just wish that people who should know actually did inform themselves!
Good luck and congrats on your pregnancy. I LOVE my BFing relationship with my DS. It is so rewarding. 