Google Gear is a technology that lets Gears-enabled Web sites store information on your hard drive. In that way, you can use the services even when your Internet link has gone down. Currently, Gears works with with Google Docs but not Spreadsheets or Presentations. You can view your Google Reader feeds offline, WordPress blogging system, ZohoWriter word processor, and Remember the Milk info manager.
The first time you visit Google Docs after you install Gears, you see a link labeled Offline in the top-right corner of the screen. Click it to open the Gears warning. After you allow the service to store information on your PC, the sync begins.