"Waking up: A guide to spirituality without religion" by neuroscientist and philosopher Sam Harris. Don't be so quick to dismiss it please, give it a try. It's not mysticism.
It's the opposite of mysticism. It's a great neuroscientist-based look at meditation. I'd highly recommend it if you're interested in meditation but put off by all the mumbo jumbo you get from many other sources of meditation info.
