If you love history you might appreciate the LeFevre commentaries at the Mises Institute.
The general theme here are audio files on liberty:
"The American Revolution" by Robert LeFevre: http://mises.org/media/1171 (http://mises.org/media/1171)
The rest of his commentaries are here: http://mises.org/media.aspx?action=category&ID=27
(http://mises.org/media.aspx?action=category&ID=27)
Fears of a Free Market: http://mises.org/media/1156
(http://mises.org/media/1156)
The Declaration of Independence http://mises.org/media/1172 (http://mises.org/media/1172)
I am trying to get my hands on: http://www.cato.org/cato-university/study_course/ (http://www.cato.org/cato-university/study_course/) you can get it at Audible.com if you belong.