How do I get my 17 month old son to sleep through the night?

Well, there are conflicting parenting ideas onn "crying it out" but I am an advocate. I'm not saying leave him there for hours on end...but 30-45 minutes of crying will NOT hurt him. He is at an age where he should be sleeping through the night. My son moved to a twin bed at age 2, so I'm not sure is he is ready for that yet...but maybe he is a little cramped or uncomfortable in his crib? My son is long and always woke himself up because he thrashes around and he would bump into the crib or get his leg stuck, so we moved him fairly early to a nice roomy bed. He's probably not potty trained yet, but it still doesn't hurt to cut off liquids so he's not pottying all night...this will prep him for training soon too. Also, make sure he isn't hungry. Offer him a bedtime snack? Get him into a strict routine and stick with it. Read a book, spend some time in his room with him before bed. Play in there a little bit, etc. Then do the routine...prayers, smooches, song...whatever. Tell him goodnight and then let him fuss in increments. Once they see you don't come after ten minutes, they see the sheer effort i takes to get you in there and they give up. The longest I've ever let my son cry was 45 minutes. And after that, he never woke up fussing again for no reason.