* you should be careful when taking for granted any "research" coming from Maharishi "University". While some of their meditation techniques may be beneficial and efficient (as are many other, non-TM meditation practices), the "Transcendental Meditation" comes with large overhead/baggage of spiritualist/anti-realist junk than no-one in any related science takes for serious.
Mindfulness In Plain English, a free book on mindfulness meditation (vipassana bhavana), one of the two main modes of Buddhist meditation (the other one being loving-kindness meditation, metta bhavana).