A tiny program that puts an icon in the right side of your menu bar. Click it to prevent your Mac from automatically going to sleep, dimming the screen or starting screen savers. Click it again to go back. Hold down the Command key while clicking to show the menu.
Maybe useless given Mac OS X's Hot Corners, but could be handy if you just like staring at logos trying to come up with just one more reason why they shouldn't use them.
- It's tricky to find a screenshot of this one ;)