Different as out of body experience or astral-projection where a particular state is defined to achieve, meditation is a general refocusing of the attention of the soul.

Introduction

THE MYSTERY OF MEDITATION (Dinu Roman)
Synthesis of the traditional teachings about meditation ...
Identification - The Essence of Meditation (Dinu Roman)
Profound reflection on the essence of meditation, focus and identification
  The Supreme Law Of Resonance (Dinu Roman)
  Karma, The Law of Action followed by Reaction (Dinu Roman)
  Heartful Mind & Mindful Heart (Dinu Roman)

Meditation FAQ (Jeffrey Chance)
Small meditation-guide

Kundalini FAQ (Kurt Keutzer)

Further backround-thoughts check out yoga-section.

Meditation Collection

Inner Healing: Meditation & Chakras (Leonie Faye)
Introduction to meditation and chakras with related meditations
Actualism: Light Meditation (Bruce R. Jaffe)
Very detailful guide on Meditation and Higher-Self realization
Mer-Ka-Ba Meditation (Drunvalo Melchizedek)
The Teaching On Spherical Breathing
Psychic Self-Defense: Tower Of Light
Visualization guidance for protecting and balancing own being
Channeling, Method for Self Discovery and Healing (Lori E. Gilbert)
Channeling preparation through a guided meditation
Planetary Clearing (Carol Willis)
How to Reach your Higher Self (Paul Dunlop)
Soul Travel (Paul Dunlop)

The Yoga Sutras Of Patanjali (Alice A. Bailey)
Profound insights to meditate on (Djwhal Kuhl channeled by Alice A. Baily)