Apple recently launch Ipad, an internet tablet device that enable you to browse internet, check mail, view photos and videos. One of the interesting feature in Ipad is the Ipad mail.
When it is in landscape view, there will be two panel, where you have the inbox in your left panel and the email contain at your right panel.
Gmail has also launch the new two panel Gmail view for Ipad (more info here), and it is possible to enable the two panel Gmail view in your Google Chrome even if you do not own an Ipad.