I thought it should be integrated in the OS, applications would set the context through the API. Software like this reads the context and manages the notes. That's to say I had a good impression, and I hope to see it on Windows one of these days.
Sorry to be slightly off topic but we could imagine the browser adapting to the context, too. There'd be a dropdown menu to select for example "Photoshop context", then it changes tabs according to the open project, and remembers them between sessions.