Abhik

The WordPress Server Load Plugin adds a Server Load Averages and Server Uptime widget into your Admin Dashboard.
This Plugin does not add any options page in your WordPress Admin Dashboard. After activating the Plugin, go to your Admin Dashboard Home and see the new widget.
Plugin developed by <a href="http://www.itsabhik.com" rel="nofollow ugc">Abhik</a>.

WordPress Server Load

The WordPress Server Load Plugin adds a Server Load Averages and Server Uptime widget into your Admin Dashboard

genkisan

<ul>
<li>easily switch on and off through Admin Options</li>
<li>display message without editing theme files (above 1st post or through widget)</li>
<li>display different message to different roles/users</li>
</ul>
Demo: 
<a href="http://ericulous.com/2007/03/09/genki_announcement/" rel="nofollow ugc">Plugin Details & Demo</a>

WordPress Server Load vs Genki Announcement