Be careful of generalizing parenting methods, also don't put too much weight on parenting when there's at least as much (though probably more) due to genetics. (There's also a nice low-hanging fruit plucked by making sure the child has enough iodine in the womb/early infancy[1].) With parenting tricks, what seems to "work" remarkably well for one child might not work at all for another child, even in the same family! I'm not a parent so I observe this lack of generalized techniques from multi-sibling families with very different sibling life outcomes and also from Feynman's anecdote on his son and his daughter. Here's him telling it: http://www.youtube.com/watch?v=Fzg1CU8t9nw (at the 49 minute mark).

[1] http://www.gwern.net/Nootropics#iodine