If you would like to share address list items with other people or across computers, I have created a custom xml file which has the extension '.minimap'. I was not able to use industry standard formats such as kml as the minimap sidebar stores additional information not available with the current KML specification.
Exporting All address list items - If you would like to export all of your address list items to .minimap, open up the minimap sidebar, go to the tools menu button on the toolbar and select ëExport All To -> .minimap
Exporting a selection address list items - If you would like to export a selection of items from your address list, use ctrl+click (mac cmd+click) or shift+click to get your multiple selection, then right click and select Share Location -> Export as .minimap
Importing - If you would like to import a .minimap file into your address list, open up the Minimap sidebar, go to the ëtoolsí menu button on the toolbar and select Import -> .minimap