One of the knocks against the iPhone has long been its lack of push email, a feature that is essential to many corporate users who live in their inboxes. It’s one of the major advantages that the BlackBerry has over the iPhone, especially for enterprise users, and even though the iPhone 3.0 software update added support for push notifications, Apple didn’t update the phone’s built-in email application with push.
Edit: As some commenters point out, push email has been available on the iPhone for other email providers, just not for Gmail.
A new 99-cent application from Tiverias Apps called GPush (iTunes link) aims to change that. Calling GPush simple would be an understatement – this app literally has a one-track mind. The only thing it does is provide push notifications for new emails in Gmail. It doesn’t open emails, or send emails, it just lets you know when new ones arrive, as soon as they arrive, and no matter what you’re doing.