This script (MtTaggedExport.php) creates a Moveable Type blog export file with tags added to the keywords field.The default MT export contains keywords and categories, but not tags. WP imports keywords as tags, so we’re going to put the MT tags into the keywords area. Everything else in the tagged export file should be exactly the same as the default export file (see notes for exceptions).
This script is for people who have been given an exported MT database but do not have admin access to the actual MT site. (If you have access to your MT installation, it is probably much easier to create custom export template [or “index template”] and do a little grep after. See this foliovision.com article and template example.)