OS X 10.5 Display Sleeper Widget
Back when I was using Tiger (10.4), I used the Sleep Display widget by Line Street Widgetry to instantly turn off my iMac’s display, but not sleep the entire machine. This was a necessity because the iMac doesn’t have a button to simply turn off the display, and it’s really annoying to wait for a 10 minute idle timeout when you’re trying to go to sleep.
Then, I upgraded to Leopard and found that this particular Sleep Display widget no longer worked. This was a bummer. I Googled around and found an application that did what I wanted, but I really wanted a dashboard widget and this was a great excuse to play with both Xcode and Dashcode and make it myself.
You can get the new widget at http://www.chriskarcher.net/software/displaysleeper.
p.s. After writing and publishing the widget, I found that you can easily sleep the display in Leopard by pressing Ctrl-Shift-Eject