I have been using a sidebar tool for monitoring Nagios
This one caught my eye
Nagstamon is a Nagios status monitor for the desktop. It connects to multiple Nagios, Opsview and Centreon monitoring servers and resides in systray or as a floating statusbar at the desktop showing a brief summary of critical, warning, unknown, unreachable and down hosts and services and pops up a detailed status overview when moving the mouse pointer over it. Connecting to displayed hosts and services is easily established by context menu via SSH, RDP and VNC. Users can be notified by sound. Hosts and Services can be filtered by category and regular expressions.
Have been using this for a few days and have found this very useful.