Skype reverse engineered

Henning Schulzrinne referred to this last week at the P2P SIP session at VON San Jose, but thanks to a mega-value uber value reader, here is the presentation on the results of a Skype reverse engineering project by EADS (whose involvement is interesting in itself). I find a lot of it technical way beyond my skills, so I would very much appreciate any feedback from mega-uber value readers everywhere. What I draw from my reading is that aspects of Skype remain remarkably and steadfastly inscrutable, though these very aspects seem to lower trust levels, and the authors seem to have significant anxieties about Skype's vulnerability to attack (as reflected in the use of the phrase "the biggest botnet ever" on slide 95).