Google Docs have recently started working with offline functions through the use of Google Gears. Gears is their engine that allows for you to perform some functions while not connected to the Internet and then synchronises when you get a connection again.
I’ve been waiting for this for Gmail for a while. I love the interface for Gmail, but get a little frustrated when I don’t have a connection, an offline version would be great.
There is now an offline version of Google calendar. However it’s read only