I’ve been obsessing over Push Notification (or lack thereof) for the iPhone for sometime now, and I’m not the only one. For me, it’s the missing iPhone feature that will make the phone complete (copy & paste be damned).

It was supposed to be released in September, but we’ve heard nothing out of Apple since the WWDC.

Assuming it does see the light of day at some point, I’m starting to wonder how many iPhone apps will actually be able to incorporate it. If I understand correctly, the Push Notification Service will require a “3rd party” server for sending data to Apple’s servers, which will then send it on to an iPhone that has a persistent IP connection.

The question is…how many iPhone developers have the infrastructure to become middlemen in this data transfer? Are any of the Twitter app developers (Twittelator, Twitterific, Tweetie, etc.) set up to handle this? Facebook and AIM, sure – but I’m wondering if a lot of apps out there might be left in the cold.