Using Gmail, Calendar and Docs without an Internet connection

It’s inevitable that you’ll occasionally find yourself in situations when you don’t have an internet connection, like planes, trains and carpools. Gmail Offline is a Chrome Web Store app that’s intended for situations when you need to read, respond to, organize and archive email without an internet connection.

http://googleenterprise.blogspot.com/2011/08/using-gmail-calendar-and-docs-without.html