For the tl;dr crowd, the link below tells the story of my staffing the Southern California Linux Expo booth at the Large Installment System Administration in San Diego (LISA '12) and how two CrunchBang-powered laptops are running the booth. Anyone else who wants to actually read what we're doing at LISA '12:
In today's world of extreme multitasking, I have to wonder if both duties could have been handled with a single laptop. I'm thinking one account logged in with luser rights and bound to the internal screen, keyboard, and trackpoint for registation, and another account (Larry t#!G) bound to the external monitor and a USB/wireless mouse and keyboard for the presentation. Virtual thin clients, if you will. The processing power is there - surely even the most modest modern laptops have surpassed the processing capabilities of the typical mainframe of 30 years ago, which routinely hosted dozens of accounts logged in via dumb terminal - and surely the software is already available? Shouldn't be that much different from running a virtual machine...
Sorry, I'm rambling.