Remi Corson

This plugin helps admins to easily create admin notification inside the WordPress administration.
You can choose many options and decide how and where to display the notifications.

Easy Admin Notification

Tested up to 3.3.1 Stable Tag: 1.4 Adds the ability to create easily notification in the admin panel

Tigerton

WordPress plugin that tell visitors to turn of IE compatibility mode if enabled.
<pre><code>Check if IE compatibility mode is enabled.
Write a custom popup text.
Select on what page types you want to enable popup. Example: only on front page or on all pages.
Select if you want visitors to be able to disable the popup for future visits.
Debug mode, to allowe the popup be displayed always, in any browser.
</code></pre>
Stay tuned as it possibly will get updated with new features.

WP IE Compatibility Checker

Prompt users to turn off IE compatibility mode if enabled.

Easy Admin Notification vs WP IE Compatibility Checker