One of the books that I found helpful was The Baby Book
by Dr. Sears. It got me started at least. After awhile, I didn't/don't agree with everything in the book but it's a good starting point. Also, you don't have to read it cover-to-cover...just pick a section that addresses an issue you have a question about.
For pregnancy and birthing information, I'd recommend Spiritual Midwifery
by Ina May Gaskin. There's no better preparation than living vicariously through others' experiences. Again, it's broken into a lot of short stories so it's not a cover-to-cover read.
For parenting prep, look for books by Alfie Kohn. I think he has great ideas on how to relate to your child.
And, last but not least, involve him in your MDC experience and encourage him to spend some time here reading about what other parents are doing/experiencing. He'll get exposed to EVERYTHING here! Heck, he should have his own membership here!
Of course, there's a ton more, but these are the ones that pop into my mind.