Depends on what you are looking for, but “The Giant Pool of Money” was one of the most popular TAL podcasts. It might be irrelevant now.
The one about the groups that try to scam Nigerian scammers is pretty entertaining.
There’s one about a early childhood education program in Harlem that focuses on teaching parenting skills to parents of kids age 0–3 that has proved to be wildly successful. It’s a good listen.
Another good one is about the “Rubber Room” in the NYC school system, which is like limbo for teachers who are on “administrative leave” for disciplinary reasons. Essentially, they draw a paycheck (sometimes for a year or two) to show up in an empty building and sit there.