If you are a fan of GTD apps you will appreciate the importance of the concept of a quick-entry. The speed it takes for an idea to pop into your head to making a note of it is important for retaining a sense of flow in your day-to-day activities. Instead of executing a task the moment it occurs to you or letting it distract your mind while you continue your current task, dump it in a reliable system knowing you will see to eventually.

OmniFocus introduced the quick-entry many moons ago for mac users but have been unable to do the same for the iphone due to restrictions preventing one app accessing the data of another and the inability to have background processes.

Users of jailbroken Iphones may however use this workaround which allows you to double tap the home button taking you straight to the omnifocus application:

1. Install 'custom homebutton' from Cydia

2. Install 'backgrounder'

3. set omnifocus to run in the background (works well most of the time, try not to background too many processes)

4. Set your homebutton to open doubletap://com.omnigroup.OmniFocus

UPDATE: 14/01/10 Latest omnifocus update  allows you to open the app with the quick entry window ready and waiting

4. Set your homebutton to open omnifocus://add?note=optional_note

03/03/10

4. Set your homebutton to open the url: omnifocus:///add?note=optional_note

(update: Thanks to Ron Molenda)

Now every time you double tap it will instantly open up omnifocus!