It's a new medium for creating that evolves with us as we work. It's not just for facts but for opinions too; not just for public data but for our own; not just for writing and storing but for showing, sharing, deciding, tracking, planning, collaborating, visualizing and programming; not just alone or with our team or family but for all of us together.
We are drowning in our own productivity. Our data is all over the place -- in space, shape and quality. Databases deal with structured info and the software that goes with it while social networks let us tag, recommend and rate. It's hard work to bring it all together to get an overview; to think about our options; to simply make good decisions. Making good decisions is hard enough, but when we try to think together, it is nearly impossible.
What we lack is a tool for people to manage data, concepts, opinions and software in a way that supports all the kinds of thinking, showing, working, trading and sharing we need to do.
It starts with what we've already put in spreadsheets, databases, wikipedia and web services. It swallows the documents and keeps talking to the services. Moving forward, it let's us express new and fancier things in ways that are easier for computers to understand and work with. It even lets us build software together which works with all this data, old or new. These apps grow out of our best efforts to make software together.