Whether you have a sponsor that has gone belly up, has changed their links, or you've just purchased an established blog from another webmaster you'll want to go download this search and replace plugin. It works just like the find and replace feature in Microsoft Office Word, and is going to save you a ton of time trying to edit posts by hand.

It does a simple search to find specific strings in your database and replaces the string with new data. You can search in ID, post-content, GUID, title, excerpt, meta-data, comments, comment-author, comment-e-mail, comment-url, tags/categories and categories-description. It is possible to replace the user-ID in all tables and the user-login for more security in the WordPress-Application.