Wherefore art thou, Push? Macworld has gone in search of the much-awaited iPhone feature that would let applications get their own notifications even while not necessarily active (so apps like Twitterific could have a little red number on them showing the number of unread tweets, and so on). But the Push system was "pulled" (still makes me laugh) from the 2.1 firmware during the beta phase, and as you probably know by now, it's still not on your iPhone.
Unfortunately, there's no official news on the subject (Apple hasn't canceled the service completely, as far as we know, but would they really tell anybody if they did), but Macworld has a few ideas: it could be that Apple has abandoned the system, thinking that it didn't really help as much as they thought it would, or Apple is still working on it, or Apple is working on something even better. Which one of those you decide is true probably depends on what you think about Apple in general, so we'll let you make your own guesses on that.
But we will say this: we're near the end of the known roadmap for the iPhone, and people are already talking about a new version of the hardware. If we don't see an update on Push in the next refresh, it's probably likely that the only thing the notification system will be pushing is daises.