The mechanisms is fairly interesting, I loved studying these plants in school. Pinguicula have mucilage on the leaves to attract insects looking for moisture. Once the insect lands it triggers the mucilage glands below it to produce more, trapping the insect. Then the digestive glands secrete enzymes that then disgest the insect. Some species have leaves which curl over the insect. This is called semi-active trapping and other carnivores trap differently. Pitcher plants/Nepenthes are passive trappers, and venus fly traps are active traps.
Thanks Camillie,
My brother had a Venus Fly Trap years ago so that's the only sort of Carnivor I am familiar with. It's interesting to hear how others work.
Just a side note - using Blackle on an LCD monitor saves no energy whatsoever...you're already using all the energy you're going to use with the backlight behind the LCD pixels. In fact, the technology for the screens involves applying voltage to the pixels to alter the polarization from the open state (pure white) to black...so blackle might actually use a slight bit more energy than google.
Now, with an ancient CRT monitor, blackle might save electricity.