I’ve come up with this function to remove extra formatting from HTML WYSIWYG editor input such as TinyMCE.

	/**
	* Remove HTML tags, including invisible text such as style and
	* script code, and embedded objects.  Add spaces around
	* block-level tags to prevent word joining after tag removal.
	*/
	function strip_html_tags( $text )
	{
	$text = preg_replace(
	array(
	// Remove invisible content
	'@<head[^>]*?>.*?</head>@siu',
	'@<style[^>]*?>.*?</style>@siu',
	'@<script[^>]*?.*?</script>@siu',
	'@<object[^>]*?.*?</object>@siu',
	'@<embed[^>]*?.*?</embed>@siu',
	'@<applet[^>]*?.*?</applet>@siu',
	'@<noframes[^>]*?.*?</noframes>@siu',
	'@<noscript[^>]*?.*?</noscript>@siu',
	'@<noembed[^>]*?.*?</noembed>@siu',
	'/class=(.*)Mso(.*)"/',
	'/class=(.*)mso(.*)"/',
	'/style=(.*)"/',
	'/<!--(.*)-->/',
	),
	array(
	' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '', '', '', '', ''
	),
	$text );
	$text = str_replace( "&lt;!--", "<!--", $text );
	$text = str_replace( "--&gt;", "-->", $text );
	$text = str_replace( "<style>", "", $text );
	$text = str_replace( "</style>", "", $text );

	return strip_tags( $text, '<address><blockquote><del><div><h1><h2><h3><h4><h5><h6><ins><p><a><b><i><u><img><pre><dl><dt><dd><li><ol><ul><table><tr><th><td><caption><abbr><acronym><span><strong><em>' );
	} // end strip_html_tags

Do you guys have any ideas?

P.S. I had a hell of a time trying to paste this into WordPress even. I guess something might need to be done there.