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WP_Folksonomy

This plugin allows your readers to add tags to your posts (like Flickr or del.icio.us).

Unzip wp_folksonomy.zip.
Upload wp_folksonomy.php to wp-content/plugins.
Activate in the Plugins menu.
Unfortunately there is not an easy way for the plugin to add the tag submission form to your theme, so you'll need to open up the .php file for your theme's single posts (probably single.php or maybe index.php) and find the tag section (look for something like: <?php the_tags('some','options');?>). After that insert the following code: <?php if(function_exists('wp_folksonomy_add_form')) wp_folksonomy_add_form();?>