A nice podcast on Python VMs

I don't have much time and patience for podcasts and I'm really happy when I find one that doesn't make me feel like I'm wasting my time. Here's probably the most informative podcast on Python that I've listened to in a long time:

• How Python runs by Chris Hefele [MP3] (Guest podcast on Python411)
  

It's a nice high level overview of CPython, Jython, IronPython, Psyco and PyPy. How they came about, what's the idea behind each of them and how they relate to each other.

The podcast is from April and in my opinion paints a somewhat rosy picture of these technologies but it's still highly recommended.