Another one, if your tastes run that way, is iThoughts (iPhone)/iThoughtsHD (iPad).
It's a mind mapping note taker - graphic outlines - which is not for everyone. But it's quick to take notes, you can use the keyboard or your fingers to meove things around, include attachments, add tasks etc. No rich text formatting.
Fabulous range of output options, including text outlines. Share via email, Dropbox and so on. I use it a lot.