Podcasts, where have you been all my life?

So about a month or two ago, I discovered podcasts. A friend mentioned she had just started listening to a true crime podcast called Serial and she was really intrigued by it. Naturally my response was "Podcast? How do I...? Huh?" And then "Is that cereal like the food?" Clearly I didn't get it quite yet. And then I forgot about it for a few weeks.

What does this app do again?

When I finally got around to downloading the podcasts, I was hooked. I finished listening to the entire Serial first season in a week. I listened to it in the car on the way to and from work. I listened it it at home, while getting ready for work. I listened to it while cooking dinner. Basically, I listened to it all the time except for sleeping.

Serial

And then it was over and I was sad. But wait! I discovered the world of Serial spin-offs! Joy returned!

What should I listen to next? Do you have any podcast series you love?