The application lets you define a set of your desired behaviors in response to events on your Android device. Each behavior/rule is defined as a pair of Trigger-Action that can be selected from a large set including SMS, bluetooth, wifi, location, headset, applications, battery and more triggers/actions.
Checkout the following link for a complete user guide, list of available triggers and actions that can be used and some tips on how to use this app to get the most out of your Android device.
AutomateIt user guide
Download from Google Play Store
Download from AppBrain
Watch the following video for a short demonstration: Demo video on YouTube
AutomateIt supports several languages translated by AutomateIt users. read more about it here.