Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 17094)
+++ wp-includes/formatting.php	(working copy)
@@ -28,7 +28,7 @@
  */
 function wptexturize($text) {
 	global $wp_cockneyreplace;
-	static $static_setup = false, $opening_quote, $closing_quote, $default_no_texturize_tags, $default_no_texturize_shortcodes, $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements;
+	static $static_setup = false, $opening_quote, $closing_quote, $en_dash, $em_dash, $default_no_texturize_tags, $default_no_texturize_shortcodes, $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements;
 	$output = '';
 	$curl = '';
 	$textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
@@ -40,6 +40,10 @@
 		$opening_quote = _x('&#8220;', 'opening curly quote');
 		/* translators: closing curly quote */
 		$closing_quote = _x('&#8221;', 'closing curly quote');
+		/* translators: en dash */
+		$en_dash = _x('&#8211;', 'en dash');
+		/* translators: em dash */
+		$em_dash = _x('&#8212;', 'em dash');
 
 		$default_no_texturize_tags = array('pre', 'code', 'kbd', 'style', 'script', 'tt');
 		$default_no_texturize_shortcodes = array('code');
@@ -54,7 +58,7 @@
 		}
 
 		$static_characters = array_merge(array('---', ' -- ', '--', ' - ', 'xn&#8211;', '...', '``', '\'\'', ' (tm)'), $cockney);
-		$static_replacements = array_merge(array('&#8212;', ' &#8212; ', '&#8211;', ' &#8211; ', 'xn--', '&#8230;', $opening_quote, $closing_quote, ' &#8482;'), $cockneyreplace);
+		$static_replacements = array_merge(array($em_dash, ' ' . $em_dash . ' ', $en_dash, ' ' . $en_dash . ' ', 'xn--', '&#8230;', $opening_quote, $closing_quote, ' &#8482;'), $cockneyreplace);
 
 		$dynamic_characters = array('/\'(\d\d(?:&#8217;|\')?s)/', '/\'(\d)/', '/(\s|\A|[([{<]|")\'/', '/(\d)"/', '/(\d)\'/', '/(\S)\'([^\'\s])/', '/(\s|\A|[([{<])"(?!\s)/', '/"(\s|\S|\Z)/', '/\'([\s.]|\Z)/', '/\b(\d+)x(\d+)\b/');
 		$dynamic_replacements = array('&#8217;$1','&#8217;$1', '$1&#8216;', '$1&#8243;', '$1&#8242;', '$1&#8217;$2', '$1' . $opening_quote . '$2', $closing_quote . '$1', '&#8217;$1', '$1&#215;$2');