Gmail and Google Calendar notifications, pushed to your iPhone home screen? Yes please. This might be enough to lure me away from the iPhone's native mail app.
The Google Mobile iTunes app update should be available here any time now. The interface, shown above, looks intuitive, and I can see it being especially helpful on the calendar side. Plus, always remember: the more notifications you check on your phone, the more rude popular people think you are. [Google Mobile Blog]