I have my iMac set to put the monitor into sleep mode after 2 hours. There are times when I want to put it to sleep on demand. Back when I had a freestanding monitor I could just hit the power button, but with an iMac the monitor is integrated into the computer - I can't turn off just the display.

Thankfully LineStreet come up with a drop dead simple Widget that you can press from Dashboard and it will put your monitor to sleep. Very handy.

And if you're not fond of Widgets, it is available as an Application too.

If you have a beautiful new iMac, you know how nice and bright the screen is. Thing is...sometimes a bright screen isn't what you're going for. Enter this widget. It allows you to IMMEDIATELY sleep just your display so that you can continue running your background jobs. It doesn't permanently affect your energy settings, so when you start working again, your monitor will not sleep immediately. It's a simple widget, but it solves an annoying problem.