Every baby is different, and they will sleep through the night when they are ready. This really sounds like a phase. THey usually up their night wakings right before they get a tooth, or are hitting a major developmental milestone. Just remember, your child needs you. They are only small for a short amount of time!
And I should add that even babies who "sleep through the night" don't! They wake up the exact same number of times! They just don't request parental assistance, which is the only difference. When you let a baby CIO, the reason they don't cry, is because they think no one will respond to them, and no one is there for them. They really don't "learn" anything. This isn't a good thing when they are learning that the world is a trusting place.
Good resources on sleep:
www.askdrsears.com
The Sleep Book by Dr. Sears
The No Cry Sleep Solution by Elizabeth Pantly
Sweet Dreams: A Pediarican's Secrets for Your Child's Good NIght Sleep by Paul Fleiss
Christian Parenting By Dr. Sears