Apple Ramping Up Testing Of Push Notifications With Developers
Apple has asked developers running iPhone OS 3.0 Beta build to download the unreleased version of an iPhone App: Associated Press that includes Push Notification feature and start testing push notification system for iPhone apps. Developers are provided a seven days trial of this Push Notification App after which it will stop functioning.
You can read the full text of the email:

Update 1:
Push Doctor is the new best Push Notification Solution:
Fix Push Notifications with Push Doctor
Posted in:
iPhone, iPhone News & Rumors on
May 19, 2009
Tags: iPhone, iPhone Apps, iPhone Games, iPhone Games, iPhone OS 3.0, Push Notification
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[...] weeks ago Apple asked developers actively working with iPhone OS 3.0 beta to help in testing the Apple Push Notification service. They selected a pre-release version of the Associated Press app for iPhone OS 3.0 to create a [...]