Useful Links

http://www.samatha.org/

There is a huge amount of material on the web about mindfulness and meditation, for example:

http://www.counselling.cam.ac.uk/selfhelp/leaflets/mindfulness

http://www.clare.cam.ac.uk/Mindfulness-at-Clare/

http://en.wikipedia.org/wiki/Samatha

http://oxfordmindfulness.org/about-mindfulness/

http://www.mentalhealth.org.uk/help-information/mental-health-a-z/M/mindfulness