This Plugin Updates all the URLs in the database to point to the new URL when making your site live or changing domains.
Under the Tools menu in the dashboard there will be a "Go Live" link.
Some plugins will store the data in the database seralized which does not allow for easy updating of the data. You may uncheck tables used by such plugins to avoid breakage and then update the urls manually for those plugins. There are future plans to allow for seralized safe updating via table by table selection but currently the only table that is safe is the options table
Most tables will be just fine to update. You may make a backup of your database, run this on all tables and if you run into trouble, restore your database, uncheck tables in sections, and rerun this until you find the culpurit. If you find a particular table gives you trouble, let me know and I will add it to the urgent list for seralized safe updating.