If you ever take your laptop to places yuo can’t get online, or if your desktop doesn’t always have a connection (or if you are on dialup) you might appreciate this new feature in Gmail Labs – Offline Gmail.
Once you turn on this feature, Gmail uses Gears to download a local cache of your mail. As long as you’re connected to the network, that cache is synchronized with Gmail’s servers. 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. Any messages you send while offline will be placed in your outbox and automatically sent the next time Gmail detects a connection.
Gmail says Offline Gmail will be available to users of Gmail in US or UK English over the next couple of days (as of Jan 27th).