Free Talk Live - Brilliant Libertarian politics show.
Todd Park Mohr's Philosophy Podcast - a stunning introduction to philosophy, highly reccomended.
Military History Podcast - As above.
GQ Audio Podcast - As above.
University Channel Podcast - Lots of lectures that are given in Universities, very good, can be quite long.
Lifehacker, 43 Folders, gladwell.com, I Will Teach You To Be Rich.