The latest, greatest tool I discovered to help work on backlinks is Social Marker. This is a great tool to quickly update your social bookmarks with new site launches. You simply add the title, URL, description text and tags. Then you select what sites you’d like to submit to. You can pre-select sites based on popularity, dofollow links, news, etc. One thing that is super great is the ability to easily register to sites you’re not yet registered with.