The free Pingdom Desktop Notifier application runs in the background and notifies you if your website is down. It uses Pingdom uptime monitoring service and lets you easily get started right inside the application, We have covered a similar utility before called Web Page Monitor also.
The Pingdom Desktop Notifier works as a completely stand-alone application, but of course all the nifty features of the Pingdom uptime monitoring service are available at the click of a mouse button if you want to use them. The application connects to the pingdom control panel so you can get more information about an outage and access more Pingdom features like reports.
Note: This application is supported on Windows XP, Vista and Windows 7.