Blase Beczkowski

It is a plugin that adds two sidebar to the dashboard of the admin panel and specjal DW Text Widget. You can place any widget in your dashboard. The whole styling is done in such a way as to keep the appearance of the administration panel in harmony. 
You can use it to leave messages or other information to all users or only for specific roles or specific user.
Thanks for downloading my plugin. I hope it will serve you well and meet your expectations.
I wish you successful cooperation.

Dashboard Widget

Very simple plugin to add sidebar with custom widget to your dashboard. You can add a sidebar which is only available to authors.

netbiel

The plugin has its own admin options page (settings page) where you can:
<ul>
<li>add user-friendly horizontal menu and dashboard metaboxes</li>
<li>completely remove blogging plarform widgets</li>
<li>change logo and link of the login page</li>
<li>customize admin bar menu</li>
<li>add custom content to the admin footer</li>
<li>hide notices (core update notice, plugin update notice and theme update notice)</li>
<li>hide screen options and help tag</li>
<li>change basic site settings e.g. hide site generator and feed links</li>
</ul>
It gives your clients a better experience of their new website.
Support for translation!
<ul>
<li>Polish translation</li>
<li>Dutch translation by Jos Wolbers</li>
</ul>
Plugin is ready for WordPress 3.6

CMS admin area

Useful and easy way to customize your WordPress admin area and the login page.

Dashboard Widget vs CMS admin area