Well, I haven't actually gotten that far in reading this yet (too many demands on my time interfering with reading the new material, blast it all!), but I'm intrigued with some of the possibilities that I haven't reached yet. For instance, biological vehicles - when I saw this, my mind immediately jumped to "MEGAFAUNA!" I believe that the Robot Handbook was mentioned as a way to design animals of the appropriate size - a biological walker would easily be used in the same way to design an analogue for dinosaurs, dragons, other such oversized beasties... (Let the evil, megalomaniacal gloating commence...)