Push Gmail for iPhone and Windows Mobile

Gmail has become something that you cannot live without. Most of the time it is necessary to check the updates in your Gmail as all your information communications contacts are centralized with Gmail. So they have come up with more ways to connect with Gmail and sync it using your iPhone or Windows mobile.

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This is what Gmail says about this new feature and how to apply it.
"ou can set up push Gmail by itself or choose to sync your Contacts and/or Calendar as well. If you're using an iPhone, make sure you're running iPhone OS version 3.0 or above (on your device, click Settings > General > About and scroll down until you see Version). If your software is out of date, follow Apple's upgrade instructions. Then, visit m.google.com/sync from your computer for set up instructions. If you're already using Google Sync, you can just enable push mail.

Once you're set up, new messages are normally pushed to your phone within seconds. While this type of speed is pretty awesome, push connections tend to use more power than fetching at intervals, so don't be surprised if your battery life isn't quite what it used to be. We've done a lot of work to optimize power usage, but if you prefer to save battery life, you can always turn off push in your phone's settings and fetch mail every 30 or 60 minutes instead."

Official Gmail Blog: Push Gmail for iPhone and Windows Mobile