A friend suggested the Feminist Mormon Housewives podcast (also on iTunes) for learning about the history of Mormon polygamy. My heritage is Mormon so I've been listening to a story that has been obscured and whitewashed over the years. It is a one year project focused on the history and is presented chronologically. I started around episode 20, but went back and started at the beginning. A fascinating period - the fanaticism of the church during the 1850s - its reformation and wars - is amazing. Brigham Young had created a 19th century theocratic equivalent of North Korea - episodes 43 and 44 are particularly interesting if you are curious about that period.
The historical podcasts are flagged as part of the 'year of polygamy' project - the remainder of the site appears to be for Mormon feminists and their struggles with the faith.
These are often over an hour long - just the thing for long commutes, trips or exercise sessions. Lindsay, the host, has done a good deal of work and regularly involves professional and amateur historians with links to sources.