Gmail va offline.
Web-based email is great because you can check it from any computer, but there's one little catch: it's inherently limited by your internet connection. From public WiFi to smartphones equipped with 3G, from mobile broadband cards to fledgling in-flight wireless on airplanes, Internet access is becoming more and more ubiquitous - but there are still times when you can't access your webmail because of an unreliable or unavailable connection.
Today we're starting to roll out an experimental feature in Gmail Labs that should help fill in those gaps: offline Gmail. So even if you're offline, you can open your web browser, go to gmail.com, and get to your mail just like you're used to. Once you turn on this feature, Gmail uses Gears to download a local cache of your mail.