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If you are a military history fan, I can't recommend Hardcore History enough. It's really a staggeringly interesting podcast. Carlin is a great story teller and the five part WWI series clocks in at over 10 hours in total, kind of an audio book really. Great for the car, I've found. He tends to focus on life for the common soldier or citizen within the context. His business model is great - things are free for about a year and then get packaged behind the paywall after that. Lots of people give him a "buck a show", just because they are so well done.
His Mogol series "Wrath of the Khans" and his Rome-Carthage series "Punic Nightmares" are also head shakingly great.