Wordpress admin notice added to functions. Classes include: updated - green , error - red, update-nag - yellow http://codex.wordpress.org/Plugin_API/Action_Reference/admin_notices To create dismissable notices: http://wptheming.com/2011/08/admin-notices-in-wordpress/

admin_notice.php

function my_admin_notice() {
    ?>
    <div class="error">
        <p><?php _e( '3/13/2013 - ATTENTION! Please do not update the Custom Post Type UI Plugin. Versions 1.0.4. and lower are causing issues with content disappearing. Version 0.9.5 is stable and should remain active until futher notice. Please contact support with any questions.', 'my-text-domain' ); ?></p>
    </div>
    <?php
}
add_action( 'admin_notices', 'my_admin_notice' );