Apple should buy you.

This is the kind of new feature that I want out of an OS update. It's incredibly useful, but requires deep system integration to work perfectly. Unfortunately, without access to private APIs, I imagine you're going to hit a wall sooner than later. For example, right now, moving a file breaks its relationship with a note, and an open file's notes aren't associated with the file's finder icon. I imagine those are both going to be tricky problems to solve.

With that said, congrats on an incredible idea, and a great early implementation. I hope it grows into something big.