Recalled an old list I had compiled of short format programming all of which had indications of free to use with permission. If any of these interest you then you should contact the appropriate parties before use..
http://www.consumeraffairs.com/radio/ has 1 minute episodes
For The Birds has 5 minute episodes: http://lauraerickson.com/Radio/CurrentPrograms.html
3 minute episodes http://www.drugtruth.net/cms/views/latest_420
ISLA EARTH RADIO SERIES 90 seconds www.islaearth.org
2 minutes http://www.jimhightower.com/ JIM HIGHTOWER’S “COMMON SENSE COMMENTARIES”
2 minute progressiveradio.org
1 minute Movie In A Minute, RadioMD News 2 minutes, and Exit Coach Radio 1 minute- all found at http://radio-linx.com
WORKER’S INDEPENDENT NEWS 3 - 5 minutes http://laborradio.org/
The Naked Scientist www.thenakedscientists.com/HTML/podcasts/
http://www.amomentintime.com has 4 minute audio episodes also on his youtube channel: https://www.youtube.com/user/amomentintimetv
10 minute religious http://www.morningmanna.com/