Recommended Reading 

Mindfulness in Plain English  by Bhante Henepola Gunaratana

This is a wonderful introduction to the practice of Vipassana Meditation.  The treatment is introductory, yet thorough.  A free version is available online.  Or you can purchase it from a bookstore.

What the Buddha Taught by Walpola Rahula

This is a very well organized introduction to the original teachings of the Buddha.  Dr. Rahula, being the first monk to ever hold a Professorship in a western university, tailors his presentation to be easily understood in western terms.