Google Bookmarks offers a simple way to export your favorite links: as a bookmarks.html that can be imported natively in most browsers. You can also use this to backup your list of links, to view them online or to move them to other bookmarking web services.
To import bookmarks or to easily manage them, you need Google Toolbar. Hopefully, Google will improve the way bookmarks are displayed, integrate the tool with Google Notebook and Google Reader and let you share your links.
Until then, Google Bookmarks is a cool way to bias Google's search results towards your favorite sites...
... to view related sites by clicking on the label displayed after the snippet or to see your bookmarks in Google Toolbar's suggestions: