Why would you need to create notes and go back to it though? Isn't searching for it much faster? Say you learned a nifty hotkey to backup text using a shortcut on OSX (or whatever). Why not simply search "hotkey backup osx"? And say that page you found it on shows up, but like you said, it's very long text page. Then just just bring up the search-in-page feature in your browser, and you're there!
Because sometimes you find an article on hacker news that you didn't search for but did stumble upon. Then you can't search for it because you weren't searching for it in the first place.
