There was an interesting request on JISCmail (see note below), the listserv for BABCP cognitive-behavioural therapists, asking about podcasts on mindfulness.  Several people wrote in with useful suggestions.  These included:

I don't know if this is exactly what you are looking for, but you can listen to Matthiew Richard on http://www.ted.com/index.php/talks/matthieu_ricard_on_the_habits_of_happiness.html  
I find the "TED talks" quite inspiring and I would recommend the talks on "how the mind works" in particular the one by Jill Bolte Taylor: http://www.ted.com/index.php/talks/jill_bolte_taylor_s_powerful_stroke_of_insight.html

To find mindfulness podcasts - go to google, press on videos (found by pressing "more" from the images, maps etc. choices) then type in Kabat-zinn or mindfulness. Some really interesting stuff there.

This is good: http://www.youtube.com/watch?v=3nwwKbM_vJc

More Jon Kabat Zinn: http://www.youtube.com/watch?v=rSU8ftmmhmw
Cognitive Neuroscience of Mindfulness Meditation: http://www.youtube.com/watch?v=sf6Q0G1iHBI&feature=related

The National Academic Mailing List Service, known as 'JISCmail', is one of a number of JANET services provided by JANET(UK) (http://www.ja.net) and funded by JISC (http://www.jisc.ac.uk). The service is run by the Science and Technology Facilities Council (www.scitech.ac.uk).