I think the fact this doesn't exist, and that hacker news, the techy portal is talking about index cards is pretty telling. I think its more of a statement of the state of our software and devices. For example, I use a notepad for tracking to dos rather than wunderlist just because even if wunderlist is blazingly fast, there is still some level of delay that is cognitively frustrating enough that I like notebooks better. Mostly is not even wunderlists fault, the delay of getting my iphone to wake up and start working effectively in those couple of seconds makes me not want to use it. Its like my phone is drunk for about 20 seconds after I bring it up. Ive gotten to the point where ive stopped using even more common features of my phone like SMS, camera, calling people for the same reason. Something about my phone puts me in a negative frame of mind I think.