People who find this stuff interesting should also check out Larry Hasting's talk "Stepping through CPython" from this years PyCon: http://www.youtube.com/watch?v=XGF3Qu4dUqk

I was at that talk. Having not done much C since college 6 or 7 years ago and only really starting Python about 3 months ago, it was very approachable and I got a lot out of it. I highly recommend it.