Podcast List 

Podcast Link Website
IMAGE CREDIT : NASA/CXC/SAO
Chandra X-ray Observatory Podcasts (Standard Definition) http://chandra.harvard.edu/resources/podcasts/sd.html  
ESOcast HD http://feeds.feedburner.com/ESOcast
  
Hidden Universe HD: NASA's Spitzer Space Telescope http://www.spitzer.caltech.edu/features/hd/hdfeed.xml
 http://www.spitzer.caltech.edu/video-audio
Hubblecast HD http://feeds.feedburner.com/hubblecast/
 www.spacetelescope.org
NASACast Video http://www.nasa.gov/rss/NASAcast_vodcast.rss
  
Astronomy Cast http://www.astronomycast.com/about/