Nimsoft maintains a dashboard gallery at http://www.nimsoft.com/dashboards/gallery.shtml. Here is a shot of a dashboard which monitors the health of an MS Exchange server:
So what or who is The Dashboard Spy? As his about page states, The Dashboard Spy is just a guy interested in the design of business dashboards. He could not find any executive dashboard design source books and so set about creating his own. Finally convinced to post his extensive collection of dashboard screenshots online, he was amazed to find how popular it has become. If you have a nice screenshot to share, please send an email to info _at_ dashboardspy.com. Also check out The Dashboard Spy’s favorite books.