1. Wuji Standing qigong (ala Cai Songfang - described in Warriors of Stillness I and Wujishi Breathing Exercise)
2. Brain Scrub as described in Pathnotes of an American Ninja Master and Secrets of Chinese Meditation
3. Inner Smile and Secret Smile - Chia and Morris
4. Silva Method of meditation
The trick is in practicing every day. Besides that...