Take Features offline with !GoogleGears.
Edit them offline & then upload them again once online.

 * http://code.google.com/apis/gears/api_database.html
 * http://dev.openlayers.org/releases/OpenLayers-2.7/doc/apidocs/files/OpenLayers/Protocol/SQL/Gears-js.html

Another approach to working offline is using an integrated !MapServer with [wiki:BluePrintGISWFSLayers WFS].

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[wiki:BluePrintGeographicInformationSystems GIS BluePrints]