find computers that never sleep
"...monitor how many computers have been left on at night or over the weekend..."
Martha Lane-Fox (lastminute.com founder) writing in The Telegraph
Shutdown Scanner was a service that monitored your computers overnight and at weekends, to see if they had been left on and were wasting power. Unfortunately, we have ourselves shut down. However, there are plans to relaunch as an open source project, if there is enough demand. Sign up to our mailing list to hear about future updates and show that the project is worth continuing with.