Some of these Google apps have been available offline at various times, and in limited release, but now they’re really available for everyone. You’ll need to use Google Chrome and an add-on that’s called Gmail Offline, but that’s one cool way of being able to use your Gmail pretty much in any situation.
The app is powered by HTML5, so it looks pretty snazzy and it’s based on the Gmail app for tablets. Once the app is installed, you can continue using Gmail by clicking the Gmail Offline icon and opening a new tab. This also works with Google Docs and Calendar but you can only view them, not modify them.
You can’t be online all the time, and if you use something like Inbox Zero, using offline Gmail might be a welcome addition to your workflow.
[via Gmail Blog]