Yeah, that was something :D
I hardly got to the non-linear features. The one I'm most interested in is an "infinite canvas" interface. Basically a way to arrange notes in 2D, like you would on a desk (without having to worry about the finiteness space). As an interface, I think it has a lot of potential, and I want to explore it for many other applications in the future.
I'm using this last day to throw together my idea of a canvas to show the idea. It's nothing new, really. Many apps do it already (eg: visual programming systems). But I think there's still lots to explore.
This evening, I'll post a final update here: https://handmade.network/forums/jam/t/8098-note_app. I'll continue to work on the project after the jam. If you're interested, I'll probably be posting over on the discord in the #project channels.
Regarding the "serious team", I think you misunderstood. That was about building a "new web", not a note taking system. Unsurprisingly, I haven't got that part at all. Though, it seems there is already some work in that area (Dan Wilhelm is giving a talk at handmade seattle titled "The Future of the Web is Low-Level"). I'm no longer too convinced that the time to build a team around that has come quite yet. I think what we need now are demos to explore directions that this thing could go. If I'm not too busy with other things, I'll throw together a prototype of my ideas after the note taking app. After all, that's the best way to explain.