My older son was a reasonable sleeper. He was fairly easy to get off to sleep and from a few months old he just woke once in the night at a predictable time.
My younger son on the other hand ... We had great difficultly getting him to sleep and he woke regularly throughout the night. We couldn't seem to establish any kind of routine. If he had been our first child we would have been sure we were doing something very wrong!
We even bought books and DVDs offering to solve our son's sleep issues. Did they work? No. My theory is that if you match the right kind of baby with the right kind of book then maybe they work. We didn't find a match.
But we did find a solution eventually. And it didn't involve cry it out or ritual sacrifice. Actually the solutions were as much about the parents as the baby and technology was involved. Very fitting in a gadget-loving household.