This is a Gadget for the vista sidebar: it can monitor any number of CruiseControl.NET servers, monitoring only the project you are interest to, and reporting the current status of the builds going on.
It's meant to be a light-weight replacement of CCTray, the monitoring tool that ships with CC.NET.
Features
Look at the Features page for a more detailed overview of CC.NET Monitor
Configuration Options
If you already installed CC.NET Monitor but don't know how to configure it, look at the Configuration Options page