Many of today's lectures and talks utilize powerpoint slides. So what I do is print out the powerpoint slides in advance and take notes on the printout. That makes me wonder. If there was an app that lets you make annotations directly on powerpoint slides and even record audio of the lecture that will sync with the powerpoint, wouldn't that be great? (The closest solution I've found to this is Livescribe pens. But they won't let you take notes on powerpoint printouts. You have to use special DOT notebook to synchronize your note with the audio recording.) Is there an app for that?