I just upgraded to 1.3 and was interested in trying out the "tags_from_album" plugin. Though activated in the admin control panel, I can't figure out how to actually make it work, searched the User Guide with no luck...

Hmmm, does seem that this plugin did not get a link to the user guide documentation for it. Here is the link: http://www.zenphoto.org/documentation/plugins/_zp-extensions---tags_from_album.php.html

You have to include a function in your theme to cause anything to happen.

Sorry, that must have escaped me.