I understand how frustrating this is - been there, done that. Still doing that, actually. I find it helps to remember that this too shall pass - way too fast, in fact. Despite the sleep deprivation & stress, you'll likely look back on these times only with fondness & a desire to be able to rewind as life speeds by.
I recommend Elizabeth Pantley's No Cry Sleep Solution, & there's a book by Dr. Jay Gordon that I've heard good things about, but try to be mentally prepared for it to take awhile. He's been at this for 5 months, it may take as long to learn new skills.
As for Cry It Out, Dr. Sears (Attachment Parenting doc) said on Dr. Phil, “When a baby screams for 10, 20 minutes, or a half-hour night after night, what actually happens to the baby's brain? The blood pressure goes up. The pressure gets so high, new blood with oxygen can't flow into the brain. So the brain can be deprived of oxygen, you guys. And that's not all. It gets worse. The brain can be flooded with stress hormones, and we know that stress hormones can damage sensitive developing nerve tissue. So, night after night, weeks and weeks of crying can actually harm a baby's brain. That's why we encourage you both to respond to your maternal intuition."
Best Wishes,
K.
Mama to Milo