Push e-mail is exactly as it sounds. Instead of the phone checking every X minutes, the server will send the e-mails out and tell the phone to download it.

"Pushing eliminates the battery drain and network usage required to keep checking for new email."

No, it doesn't. Every time there is a single message, it requires the battery drain and network usage of bringing that connection out of idle.

If you get 10 emails per hour and you set your polling interval to 15 minutes, your "pull" email will result in four network connections.

Your "push" email will result in 10 connections and will interfere with the ~5 minute idle disconnect, basically keeping your connection active all the time. Your battery will drain much FASTER unless you get less than four emails per hour. But if you don't get email that often, what's the point of push email?

And when oh when will the iPhone's Notes sync with something useful instead of a dumb subfolder of Mail.app?

It certainly looks like Gmail will have that option if that screenshot is real (which there is no reason to believe it isn't right now). How do you know Gmail will not have the push option?

Well, to be honest, Gmail and Yahoo! have never had a device that they could "push" e-mail to.

I'd guess that Gmail is gonna drop the "push" e-mail bomb soon.

The battery saving statement is not exactly true, push email works in a very odd way.

The phone connects to the server over https (if you use http you should be stabbed with your handheld in the eye) and opens a https connection to the server, it then asks the server if there is any new info (contacts, calendar, mail) if there is it starts a sync process if not then it holds the session open. It does this every 30 minutes, so basically every thirty minutes your phone will connect via https a connection and ask for confirmation of the sync status the server does not respond if there is no new mail thus when new mail or whatever comes in within that 30 minute window the server responds on that session and the phone initiates a full sync.

Thus theoretically its holding open a 3g connection permanently and i can tell you from experience on my nokia n95 (ahh a nokia user get him!) that full push nails your battery ALOT faster than say putting it to do a manual sync every 30 minutes.

Gmail has been able to push (it's called IMAP-idle) email to other devices ever since Gmail first introduced its IMAP email. Gmail will push email (almost instantly) to any device (for instance a Treo using the Chatter email application) that uses an IMAP-idle mail client.

The confusion arises when Apple failed to make the iPhone's mail client, IMAP idle compliant (instead apple setup some sort of strange proprietary deal with Yahoo mail). As soon as Apple makes the iPhone's mail client IMAP idle compliant, we can use Gmail, fastmail, or whatever mail service we want (that supports the normal imap idle standard) to have email pushed to the iphone.

I've used this on a Treo with Gmail and it didn't eat batter life very much and was more efficient (providing you don't get a massive amount of email) than having the client pull down to itself every 15 minutes.

That's some stupid Outlook/Entourage thing called ActiveLink. It's Pseudo-push. Push is solely controlled by the IMAP server.

Err... it already does that stuff? If you sync your .Mac stuff to your computer, then your iPhone will automatically sync that stuff to. What am I missing here?

I'm pretty sure he's talking about OTA sync.

It's not a fake... and it is under the main settings for now.

Some of us were accepted into the program to test these things... so that's what we're doing and that's how we know. However, I do agree it might be better placed under Mail.

So far it seems to work pretty well. Gmail is fetch only as of now... .Mac and Exchange are push or fetch depending on preference and it works pretty well so far. I haven't noticed any negative impact to battery life.