First we had customizable ringtones, now we have customizable vibration alerts in iOS 5. Technology has come a long way!
While custom vibration alerts may not be as sexy as notifications, camera swipe, iMessage, or PC Free, it is an interesting development nonetheless.
Instead of just being able to setup custom ringtones to help identify specific callers, you will be able to setup custom vibrations to alert you of calls from certain people. You will be able to dictate the tempo and beats of your custom vibration alert that can last as long as 30 seconds.