I don't know if the plugin supports 3.1 yet, I'm sure there's still some testing to do. I get the following error on my single post page when I activate the plugin:
Warning]: Header may not contain more than a single header, new line detected. in /home/user/public_html/website/wordpress/wp-includes/link-template.php on line 2435
Thanks for any insight you can provide. I'll deactivate it for now.