I'm surprised that this hasn't been written about more but if you are looking for a baseball card podcast to keep you busy during your commute or when you are bored in class, check out the work done by Superfractor.com. They've done five episodes thus far with a couple extra interviews thrown in and I have enjoyed every one.
The podcasts are pretty prospects/up-and-coming stars heavy which I love because I know next to nothing about minor league prospects. Also, the host of the episodes, Rob Zeida, has really come into his own as an interviewer over the course of these episodes.
In as much that Wax Heaven and Stale Gum are required reading for baseball card fans, the Superfractor.com podcasts should be required listening.
Download the episodes here [through iTunes]:
Interview with Brian Gray from Razor.