If this feature works robustly (and if Google ever has enough confidence in Google Docs to remove the "beta" suffix...), it's a major milestone
The offline feature of Google Docs temporarily stores documents changes on a user's local computer. Once reconnected to the Internet, any changes the user made will automatically be synchronized and stored on Google-hosted computers.
"This is still early days. We're working to make more Web applications and functions work where connections are unavailable," Google said in a statement.