I have my macbook hooked up to my LCD tv via a HDMI-DVI connection and I watch alot of streaming media through it. However I am tired of having to disable the screensaver and then go into power settings and shut off the display dimmer just so I dont have to keep moving the mouse. Then I have to remember to set it back. Its a pain.

Caffeine runs in the menu bar and with a simple click you disable screensaver, screen dimmer, and probably more. Check it out.