Two months ago, I shared a podcast that shows the beneficial impact of meditation on the brain.
Along the same lines, I am glad to be able to share this GoogleTechTalk with you. It shows some very interesting research on the reaction of the brain and heart to compassion training.
You can sign up for a mindfulness course online here - I recommended it wholeheartedly. Thanks to this course, I now get up early in the morning to meditate.