W.,
At the risk of being ousted by everyone else on here, I think your situation sounds a lot like mine was and I have a few other tips, pretty opposite the others on here.
One thing no one else has mentioned is checking for any medical issues. My son ended up having reflux and milk intolerance, which causes night waking and very frequent nursing. I tried most every tip given on here including a top off formula bottle with rice (GI said to to help it stay down) and NOTHING helped. We swaddled until 7 months when he could no longer fit into his custim made swaddle blanket! Some kids have apnea too!
The book I recommend is William Sears' night time parenting. It is published by LLL. My son still wakes once or twice at 15 mo and you know what? I go in there! He does now put himself to sleep and takes a wonderful 2.5-3 hr nap. But, some kids just aren't programmed to sleep all night until much later. I read all the books listed so far, and I would add to that list the less harsh No Cry Sleep Solution by Pantley.
Please, please don't let him CIO yet, as he's not old enough!!
If you get really desperate though, and want to do the babywise, schedule kind of thing, you can check out this lady:
http://www.nannyfornewborns.com/
Good luck, and feel free to email me if you want to talk to someone who won't pressure you to have him CIO like EVERYONE did for me!
R.