Boy, I am just cranking out the modules this month.

http://drupal.org/project/scanner

The Search and Replace Scanner can do regular expression matches against the body and CCK text content fields on all nodes in your system. This is handy for finding html strings that Drupal’s normal search will ignore. And it can replace the matched text. Very handy if you are changing the name of your company, or are changing the URL of a link included multiple times in multiple nodes.

The module allow you to configure which fields and tables to work with, and also to add in custom tables and fields for modules that don’t use CCK.