I can only reiterate what the others have said. I started BW at about 2 months for moving daytime naps from rocker chair to cot, and haven't looked back. My 8 month old Caspar (Textbook) will pretty much fall asleep in any friend's cot, we have a nap time routine and he's so used it it, he will go down quietly. Tracy's book is fantastic for learning your LO's cues, this has helped me so much and I think it makes for one very chilled out baby. If you meet their needs as soon as they have them, they feel relaxed and trusting - we still have no separation anxiety here (unlike a friend who was a Gina Ford mum) - and I can leave Caspar with any friend or familiy member, or in a strange house or place, and he's fine.
Congratulations on your LO, and please do get your wife to check out these boards, they have been full of valuable advice for me and many others! Its great to see a dad on here, my H was suspicious at first of BW, but when he had to look after Caspar recently for 2 days whilst I had an operation, he really realised how great it was, and how easy (pun intended!) it made the day!