I don't know about you, but as someone who works full time- I'm out of the house 10-12hours a day just with work- and sleeps, my TV isn't on that much.
And assuming 1W for 8 hours (while I'm at work), that's... ooh... all of 2 moderate AA batteries' power. Not exactly a lot- in fact assuming that the PC you're writing this message on is using 400W (tower, peripherals, monitor, modem, discounting the bits of the internet infrastructure you're using) that's a whole 72 seconds of power for your computer.
You'd have saved more power NOT writing those messages than I would have by not putting my TV off rather than on standby. And-interestingly- I'd "spend" more energy waiting for it to turn on and off all the time over a day than I would by leaving it on standby.
Also, your projector's bulb will pretty quickly burn out with decent use and need replacing. Which means manufacturing and shipping costs, transport to/from the shop, or running that PC of yours for longer.
The energy wasted trying to eek a few hundred mWh of power back from consumers would be far better spent removing wasteful legislation and letting traffic flow better around cities. Hell, with the amount of money spent by whining pseudo-greens (how much CO2 was given out getting to that whale to record it's song, BTW?) so far we'd have been able to give everyone in the UK an A4 sized solar panel- enough to power my gadget-laden house's devices (when on standby) with room for expansion.
Guilt sucks- people hate feeling guilty. And when you're bombarded with 100 trillion things to be guilty about every day it also loses its effect.
As a suggestion to the gov't if they're reading: why not just tax the individual barrels of oil produced in the UK a dollar or two each, then rid yourself of the other arbitrary taxes? The highest users (hence highest polluters, I guess) would pay lots, the lowest users would pay proportionally less. And it'd cover petrol, diesel, aircraft fuel, oil, gas, electricity, power for services, and all sorts. Then use that tax money to construct- and encourage the private construction of- less polluting renewable energy sources.
Normal man-in-the-street would see taxes falling and vote for you, power generation people would mysteriously find ways of making themselves cleaner, and more nuke plants would be created, meaning less fissile materials floating about for military uses. And the wells currently marked out for carbon sequestering could be used for storing nuclear waste- it'd be hundreds of meters below the sea, stuck in apparently gastight conditions, and would be so much more dense than oil that we could get the last few drops out of the well before it became uneconomical. And it'd never bubble to the surface if there was a crack, unlike CO2.
The consumers are already paying a green tax of sorts. You leave your TV on standby, you get billed a little at the end of the month for that TV being left on standby by your electric company. Leave it on with brightness turned up to full and speakers blaring all day every day and you'll get a bloody huge bill.
Surely then it's the energy generation/transmission people who should be legislated to make things greener rather than the consumer? And those who say Not In My Back Yard to Wind Farms, or "OMG! A beautiful display of Biritsh engineering (and employment) and far-sightedness will spoil the scenery in a bit of Scotland I've never been to!" should be ignored. Or burnt for power. Either's good.
Apologies for length. I believe I may have started ranting a few thousand words back...