I'm currently listening to 214! I didn't like it at first because they kind of ramble and go off topic, but I eventually gave into it and love it now. All my other podcasts are on the back burner.
They've had Sarah Ramos on a few times (Hattie from Parenthood). The most recent episode has Keiko Agena (Lane) and Sarah Ramos (again). Scott Patterson has been on.
I loved the episode with the casting directors.
Into the Woods Brad is my favorite famous guest so far. Though Helen Pai was amazing.
"This prick is asking for someone here to bring him to task Somebody give me some dirt on this vacuous mass so we can at last unmask him I'll pull the trigger on it, someone load the gun and cock it While we were all watching, he got Washington in his pocket."