A method has been provided with ArcGIS 10 to remove machine names from an item's metadata. Use the geoprocessing model described in this Help topic: <a href="http://help.arcgis.com/en/arcgisdesktop/10.0/help/003t/003t00000026000000.htm" target="_blank">http://help.arcgis.com/en/arcgisdesktop/10.0/help/003t/003t00000026000000.htm</a> with the XSLT stylesheet "remove local storage.xslt", provided at <ArcGIS Install Location>\Metadata\Stylesheets\gpTools.