If you have been using your iPad to check your Gmail account you will have noticed that recently Gmail has changed to give you a full compose window rather than having a split screen between the inbox and compose screens.
Google have updated the Gmail website to detect iPad’s and to hide the inbox messages on the side and make more of the compose screen which is now visible immediately.
Below: The iPad showing the new Gmail compose window.

To try out Gmail on the iPad, just go to gmail.com in Safari. Please note that the new interface is only available in US English at the moment and google have not confirmed plans to roll this out in other languages.