wp_list_tags a-like, mimics (some of) the functionality of wp_list_categories

theme_list_tags_v1.0.php

function theme_list_tags( $args ) {
    
    $current_url = $_SERVER['REQUEST_URI'];
    
    /* get_tags shares a subset of its parameters with 
       wp_get_catgeories, :
      
      'orderby'              => 'name',
      'order'                => 'ASC',
      'hide_empty'           => true
      'exclude'              => ''
      'include'              => ''
      'number'               => null
      hierarchical           => true
       
      So we'll just pass the $args through.
      See the codex for further details of additional
      get_tags() parameters
    */
    
    $tags = get_tags( $args );
    
    $html = '<div class="taglist">';
    
    foreach ($tags as $tag){
        
        $tag_link = get_tag_link($tag->term_id);
        $html .= "<li class='tag_item {$tag->slug}";
        
        if(  substr($tag_link, -strlen($current_url) ) === $current_url ) {
            $html.=" current-tag"; 
        }
        $html .= "'><a href='{$tag_link}'>";
        $html .= "{$tag->name}";
        
        if( $args['show_count'] == true) {
            $html .= " (".$tag->count.")";
        }
        
        $html .= "</a></li>";
    }
    
    $html .= '</div>';
    echo $html; 
}

This code adds a 'current_tag' class to any tag whose URL can be found at the end of tyhe current Wordpress URL in the same way as the list_categories function does. Blogged at http://www.enigmaticape.com/blog/wordpress-listing-tags-like-wp_list_categories/