I would suggest the RT and Off Topic Podcasts if you're a fan of Achievement Hunter and Rooster Teeth. They both put out 60-90 minute podcasts about a variety of things weekly.

How Stuff Works can be interesting

I like the myths and legends podcast or psychobabble

Right up your alley would be Michael Savage. ;-)

Welcome to Night Vale is amazing

If you line rt and offtopic check out internet box

The co optional podcast is great. They talk about video games mostly but they go off on tangents and are pretty funny. Look up co optional podcast animaged shorts on youtube if you're interested

I enjoy Stuff You Missed in History Class, and, if you're into it, the Cato Institute (a libertarian leaning think tank) releases a podcast daily, Cato Daily Podcast!

Welcome to nightvale, wolf 359, the black tapes and T.A.N.I.S are all really good

Lore is a really good podcast. It gives the history of myths and the supernatural. It's really interesting. I highly recommend it.