There are many wonderful books on meditation.  Following are some that I recommend to my beginner meditation class.  Of course, you know the secret of meditation isn't reading books about it, but actually sitting down and practicing meditation.  These books are just helpful friends along the way.

BEGINNER'S GUIDE TO MEDITATION   by Goswami Kriyananda

SPIRITUAL SCIENCE OF KRIYA YOGA by Goswami Kriyananda

THE MIRACLE OF MINDFULLNESS by Thich Nhat Hanh

BEING PEACE by Thich Nhat Hanh

WHEREVER YOU GO, THERE YOU ARE  by John Kabat-Zinn

THE WAY OF THE PILGRIM  trans. by R. M. French

ZEN FLESH, ZEN BONES  compiled by Paul Reps

ZEN MIND, BEGINNER'S MIND  Shunryu Suzuki Roshi