It seems that there’s something wrong with Apple’s push notification service:
If you’ve been monitoring “push notifications” on Twitter like I have to try and catch new apps as they come out, then you know exactly what I’m talking about. The majority of talk seems to be vitriol against Apple for not approving the push-enabled version of the popular Beejive instant messenger, which has been under review for at least a week and a half now. Also in high demand is IM+, also currently under review, and AIM. Basically, people really want an IM client with push, and also a Twitter client, though I’ve yet to see any conclusive proof that there is definitely one that is either pending review or in the works.
Apple’s working on getting the backend of the service ready for the deluge of high-volume notifications apps apps. Until they can get that fixed, they’re holding back the release of notification enabled apps to a trickle. Let’s hope that will be soon.