borg: iPhone Org-mode app
NOTE: borg (now called beorg) is on the App Store! Read about version 1
If use Org-mode and have an iPhone carry on reading.
As you know Org-mode is a fantastic plaintext based system for outlining, task planning, authoring and more. Many people, myself included, started using Emacs because of Org-mode.
You are probably also aware that there is an iOS Org-mode app called MobileOrg. It allows for sync and editing of your org files on your iOS device.