@tsalta:I'm sorry but and don't know if there is a difference from this application because now it's the first time I've heard of TurnOffTheLight. But even if they are the same, it's not the first time there are multiple WM applications that do the same thing. Each user is free to use the one he wants
The application to put the device in sleep mode it has been on my blog since last year (
http://www.lavirgil.ro/2009/06/windows-mobile-backlight-off/). The post is in Romanian and I don't think that helps you
but you can download the application from below: