I found a site several months ago for a productivity tool that marketed itself as a different way of organizing your...todo stuff (or maybe notes?), using a graph-like interface--with nodes and edges--perhaps like a mind-map. There was a user quote on the site saying that it was an epiphany for them when they realized how well it worked to organize things in an "associative" fashion instead of in lists.
I don't remember if it was more of a notes system that might replace something like Evernote, or a todo list sytem that might replace something like Remember The Milk. (Or both).
I believe it's a relatively new app. But now I can't find it. Any idea what it was?