Actually, not a podcast, but a screencast.  This is something I’ve been wanting to do all semester, but just never got to it.  Let me know what you think.
This is the YouTube version, but there is a better version on the Geometry Website.  If you use iTunes, you can click “Subscribe” on the Geometry site and have them automatically downloaded when a new one comes out.  I plan on doing these for each of the benchmarks next semester.  And if you’re nerdy lucky enough to have a video iPod (maybe this Christmas?), these should fit on there just fine.  Enjoy.