A video showing how Gmail works online or offline.

With a new feature in Gmail Labs, the Google development apps, well you can now use Gmail while offline.

Basically it works by Google Gears downloading a cache of your mail, by synchronizing with Gmail’s servers

The features switches Gmail to offline mode if you have bad or none connection at all.

It also send/receives messages once a connection is detected.

Basically Google’s goal is so you can use “browser-based Gmail experience” whether you’re online or offline. Cool eh!