This app I develop for a while, it mostly tailored for my way of thinking, but maybe useful for some body else. The main feature is that every word is a hashtag by default. Yes simple as that, but it took a while do discover this. And this allows you to hop from notes to notes in the same fashion as brain does (at least for some percentage of people).
Currently only one web-site is supported - Hacker News :) and only to display text content. But I am working on proper html display with all current standards.
I play with the idea of a spatial canvas editor in a browser, the project used to be about projectional editing but I decided to reduce scope and focus on bootstraping it. So now I was able to actually edit my code right from my editor.