Sky

I am using plugin Simple Tagging. I made a slight modification to STP_RelatedTags and outputRelatedTags functions and uses STP_RelatedTags to show the related tags to the current tag being viewed. Basically, if a post is tagged with A and B, then tag A and B are related.
I also use the below to generate the browse tags path.
Eg. navigate_tags(’php+Wordpress‘) will produce >> php >> Wordpress
The tag navigation is equivalent to the one I used in Sky Explorer for application menu.

function get_tags($tag) {
	return explode("+", $tag);
}

function navigate_tags($tag) {
	$tags = get_tags($tag);
	$tagUri = '/tag/';
	$link = '';
	$tagfmt = '>> <a href="%link%">%name%</a> ';
	$tagvars = array("%link%", "%name%");
	$nav = '';
	foreach ($tags as $t) {
		$link .= (($link != '')? '+' : '') . $t;
		$nav .= str_replace($tagvars, array($tagUri.$link, $t), $tagfmt);
	}
	return $nav;
}