Gmail Labs launched a new feature to enable a Gmail offline mode. The idea behind this is that you store your mail on your local computer (make sure it’s yours!) so you can access it even when you don’t have a connection available. Another feature is that any mail that you write offline will be sent next you go online. Of course this is making extensive use of the cool Google Gears technoology that so many web applications already use, like the back-end of WordPress for example.
To enable Gmail offline just click the green flask beside your name and enable it on the panel. Now you will get a new ‘Offline’ link with a version number in red (0.1 as today). Click it and you will be prompted with a wizard that will ask you to enable Gears for Gmail.