iOS, Android, and even BlackBerry allow you to specify an icon that is displayed when you bookmark a page to the device's homescreen. And now Windows 8 allows you to specify an icon that appears when a page is pinned to the start screen as follows:
<meta name="msapplication-TileImage" content="logo144.png"/>
However, this doesn't seem to apply to Windows Phone 8. Is that correct? Is there some other way in WP8 to specify an icon to be used (instead of a screenshot) that my Google ninja skills have failed uncover?