Push Notification is released for Android and iPhone.
this is again free service as all other services at iBuildApp.
the instructions how to use it will be posted tonight:
Update from 10/5/11:
the Step by Step instructions how to use Push Notifications can be found below:
iPhone: http://ibuildapp.com/faq-iphone/#34 – iPhone
Android: http://ibuildapp.com/faq-android/#18 – Android