Here a bhikkhu (monk), gone to the forest or to the root of a treeor to an empty hut, sits down; having folded his legs crosswise, set his body erect, and established mindfulness in front of him. . .
Meditation: Why Bother
Buddhist Traditions of Meditation
Basic Breath Meditation Instructions
The How and the Why
Mindfulness With Breathing: Getting Started
Meditation in the Tibetan Tradition
The Dalai Lama
Introduction to Zen Meditation
John Daishin Buksbazen
For much more, see the Meditation section of the DharmaNet Learning Center.