There is a low power FM “micro-radio” movement (in case you hadn’t heard) and Radio4All gives you access to the movement, downloadable (free!) audio and some of the stations.
Some of the audio comes from the LA Sound Posse who record and make available such items as Vandana Shiva’s lecture at Scripps College last December on “Real Wealth, Real Poverty: How Economic Globalization is Robbing the Poor of Wealth.”
Listen, learn and act, people! :)