I know "Internet Explorer is not yet supported" is a known issue, just thought I'd add a note that in IE 9 Mobile - the browser used by Windows Phone 7.8 - the feature is completely nonfunctional, producing only an unclickable gray horizontal line. I realize that the number of people using the site with WP 7.8 devices is probably low and getting lower, but thought it was worth making a note of anyway.
Topic on Talk:Compact Personal Bar
Scott: If it's a mobile device displaying a desktop page there's probably little-to-no chance, especially on Windows Phone, for the issue to be fixed. Does the mobile site not work for you for some reason?