Yes, the recording of the call is also available through the web interface. I haven't attempted to make it available through the customer IVR side of things yet (if you call your RingThink number from your cellphone you get an admin interface), but that's certainly doable.

To be honest, while I have an account I haven't played with Google Voice too much (I live in Canada so it isn't officially available here yet). This was something I came up with to respond to Twilio's weekly SMS competition, it's been fun to build out so far.