The topic was dry, yet the delivery was thorough and well presented. I watched with my team and this elicited several gasps of "woah" as we learned new things about the VCS we loathe to love. Joshua gave us a tiny peek behind the .git/object/ curtain and provided enough knowledge to enable us to pull the curtain back a little farther ourselves.
I really liked this talk on the internals of Git. Very thorough. Thanks Joshua!