John Musser’s excellent Web 2.0 resource Programmable Web (with 1,452 mashups listed!) has included the Pingdom API system tray alerter among its Best New Mashups.
The Pingdom API allows anyone with a Pingdom account to access all of his/her uptime monitoring data. We previously dedicated a full blog entry to the Windows system tray alerter that was built using the API. The small application alerts you of any downtime detected by Pingdom and was developed by IowaComputerGurus.