How can I force the display to sleep (MB)

I'm wondering if there is a way to pick a hot corner that would force the display to sleep/go black? I have set one to turn on a screen saver, but sometimes I'd just like to force the screen to sleep instantly. Like tonight I was importing CD's to itunes while watching TV. The screen saver was just so bright and it seems like a waste of energy. I would have liked to force the display to sleep sooner that the timer in Preferences will do it.

Thanks!

desktop f13 laptop f1

I use this widget to put my display to sleep:

http://linestreet.googlepages.com/sleepdisplaywidget

It's also available as an app.

Also if you have the latest version of SizzlingKeys installed it lets you assign a hotkey to put the display to sleep.

Thank you! The F1 trick was easy. I'll look up those widgets later prob. I appreciate it!