I came across an audio book of Murray Rothbard's Conceived in Liberty.
It's laid out backwards, i.e., you have to go to page 4 to get the first clip, and it is very long. But the woman who reads it does a fine job and it is an absolutely brilliant exposition of history from a radical libertarian--dare I say anarchist--perspective. But Rothbard wasn't just a ranter. He was a master historian and his prose is very lucid.
I'm about halfway through it so far, but my brain is already bigger.