Crying it out was the bane of our existence! Our poor little girl never adjusted to all the crying, and we never adjusted to leaving her alone for so long!
So we gave up on CIO and then she started sleeping through the night about 4-6 weeks later (around 8 months). She's 11 months now and sleeps through the night about 80% of the time. When she doesn't, she usually goes back down to sleep pretty easily if we feed her a bottle (or my wife breast feeds her).
So personally I think the whole cry it out system is somewhat cruel for both the babies and the parents, especially when after trying it for a couple weeks it doesn't even work!
I think the best technique is somewhere in between what is recommended by the Ferber method and what is recommended by Dr. Sears.
