Gmail has new feature called Google Gears. It is a web browser plug-in, that allows you to work in Web applications without internet connection. When you lose your connection, Gmail automatically switches to offline mode, and uses the data stored on your computer's hard drive instead of the information sent across the network. You can read messages, star and label them, and do all of the things you're used to doing while reading your webmail online.Below, you can find Tutorial guide, step by step, "How to install Google Gears"