That Russian website post about accessing a pre-pre-release of iPhone OS 2.2.1 and finding Push Notification Service and Notes Sync? Turns out not so much. BGR says:
The site that houses the forum has posted an update to the blog post that brought attention to the push notification claim, and has stated the original posting was indeed a fake.
So we can all go back to our regularly complaining about PNS being late again, b'okay?