I'm resurrecting this topic. I'm like a necromancer. And I'm doing it because I love podcasts, and want to talk about them.
So, here's my list of podcasts I've been listening to recently:
1) Trans-Ponder
2) Miss Gender
3) The Atheist Experience
4) The Mystery Show
5) Serial
6) Writing Excuses
7) The Non-Prophets

The Worst Idea of All Time
9) Welcome to Nightvale
10) Watch Out for Fireballs
11) Retronauts
The first two are the best Trans related podcasts I've found so far. Two of the others are run by the Atheist Community of Austin (TAE and The Non-Prophets), and are always good for a listen if you're of the non-spiritual ilk. Serial and Mystery Show are famous enough to stand without my recommendation. Writing Excuses is a short, 15-minute weekly about writing genre fiction. The Worst Idea of All Time is two Kiwi comedians watching and reviewing terrible movies once a week for a year (Year 1 was Grown Ups 2 and Year 2 is Sex and the City 2). WOFF and Retronauts are retro video game casts, WOFF tends to be longer form with a focus on a single game, and Retronauts tends to be shorter and more widely foucsed. Welcome to Nightvale is a weird horror/humor scripted show that inspired my name.
All are great listens, and I hope I can find more podcasts via my resurrection of this thread.