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Insomnia
Insomnia is an iPhone native application that, when enabled, will prevent the iPhone from sleeping, thus overriding its default behaviour. This allows background applications to continue to run and WiFi to work long after the screen has been switched off.
(The iPhone's default behaviour is to sleep 30 seconds after the screen has gone off, when not docked and charging that is).
Uses
Insomnia is useful if you are running a logging application that you would want to keep working while your phone is locked and the display is off.
If you are using an IM or IRC client that you wish to stay connected to receive messages while the screen is off.
If you are the creator of a logging or IM application hopefully you can use the Insomnia source to build the ability to stay on into your application, without harmfully deleting power config files. e.g. ApolloIM and MobileChat.
Installation
You will soon find Insomnia in Installer.app in the Utilities section once you have installed the Community Sources. Alternatively you can download Insomnia from the link on the right, extract it, and copy it to your Applications folder on your iPhone using Transmit, Fugu on a Mac or WinSCP on Windows, then either restart Springboard or restart the phone to see the new icon.
Usage
Tap the Insomnia icon to enable it and you will see an "On" badge on the icon as shown below. To turn it off tap it again.
Related software
To prevent your Mac laptop from sleeping when the lid is closed checkout InsomniaX