Ever noticed that on tag-pages multiple tags are possible? E.g. if you want to show all
posts having “tag1” AND “tag2”, just go to
http://yourwordpressblog/tag/tag1+tag2

But only “tag1” is correctly displayed (see screenshots).
With this plugin you can use more than one tag correctly. This is especially interesting if
you want to optimize some key phrases (like “tag1 tag2”) for searchengines.

Moreover this plugin can add the description of the tags to your tag-pages, simply put

<?php echo multi_tags_get_description('<p>', '</p>'); ?>

into your theme-file “tag.php”.
To display the correct tags, just replace the call to

single_tag_title( '', false )

with

if (function_exists('multi_tags_get_title'))
    echo multi_tags_get_title('and', 'or')
else
    single_tag_title( '', false )

The inclusion of your tags into “meta keywords” resp. the inclusion of the tag-descriptions
in “meta description” is done by the plugin.
Simply check the corresponding checkboxes in the MultiTags-setting-page.

For more examples and background information have a look at:

http://www.vogel-nest.de/wp_multitags_plugin

Thanks

To Frank Bueltge http://bueltge.de for motivation and checking the first draft.