The Montastic Yahoo widget allows you to keep an eye on your servers from your desktop. To use this widget you'll need first to install the Yahoo widget engine. 

• Author: Metadot Corp .
• License: free
• Platform: Windows and Mac
• Download Montastic widget

Same but for Mac OS X. 

• Author: Jim Menard
• License: Apache 2.0
  
• Platform: Mac OS X 10.4 and above.
  
• Download Montastic for Mac