Draftin, iA etc are good when you know what you want to write, but we kept 'quickdump' textfiles on our desktops and the occasional mail to ourselves.
The thinking is really in the details, fast in terms of as few clicks and taps as possible. Having to click 3 times to open the last google doc or similar just to paste in an idea or copy something over didn't cut it for us.
Is this a web-based version of Notational Velocity with a sidebar that does a websearch on certain elements of what I'm writing?
Draftin.com already serves me well as a web-based note-taking thingy, plus great collaboration tools.
I guess here's the question: what's the use case for the sidebar?