20 minute guided mindfulness exercise by Jeremy Woodall

     http://www.youtube.com/watch?v=thYoV-MCVs0

Guided meditations by Tara Brach

      http://www.tarabrach.com/audioarchives-guided-meditations.html

Meditations from Mindfulness

     http://franticworld.com/free-meditations-from-mindfulness/

Relaxation exercises from UW-Madison

     http://www.uhs.wisc.edu/health-topics/stress/relaxation.shtml://