Skype's Architecture

I just stumbled across a presentation that has a complete technical breakdown of Skype's network architecture and protocols. Very nice. Update: Peter Schow on the p2p-hackers list reports that the presentation actually borrows its information from a paper entitled "An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol" by Salman A. Baset and Henning Schulzrinne. In a nice coincidence Henning was actually my Digital Logic teacher in college.