Google Chrome Frame plugin for WordPress by KANKOD will prompt your Internet Explorer users to install the Google Chrome Frame add-on (automatically redirects back to your site when finished), this will let your old Internet Explorer users benefit from the latest HTML5 standards as if they were running Google Chrome or other advances webkit browser.
More Info at: http://www.kankod.com
Download: http://wordpress.org/extend/plugins/google-chrome-frame-for-wordpress-aka-gcf/