I usually send my G5 to sleep when I'm not using it. (Meaning: when I'm not there, and when I'm not running some P2P app. Which I don't do very often really.) That saves a lot of power (spinning HDs, fans, power supply), and it's no hardship as it only takes a few seconds to wake up again.

My LCD monitor takes less power than that, but it's still an appreciable amount judging from its temperature. Turning it off is trivial, and it takes a similar few seconds to come on again, so I always turn it off when I'm not using it.

My router, though, is different. It has no moving parts, and uses much less power. (It is slightly warm to the touch, admittedly, but it probably wouldn't be if I didn't pile things on top of it.) It has no sleep mode; and so the only way to save that power is to turn it off, and then wait a minute or two for it to reconnect after turning it back on. (Assuming all's well.) Much less benefit, much more hassle. Guess whether I turn it off. Go on, you'll never guess...

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Andy/