A group studying this at Livermore-Berkeley Labs has esitmated that all standby-powered equipment accounts for about 5% of all residential power use. A typical standby device draws about 4-5 watts.
Another figure that's worth looking at is computer power. A friend that does capacity planning estimates laptops being left on and not used or used for typical office tasks draw 50 watts (~1kWh per day), desktops 200 watts (~5kWH per day) and servers (running more or less full-tilt all the time with many disks) draw about 400 watts (~10kWh per day). Around here, that means two desktop computers left on all the time cost about $500 per year.
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Another figure that's worth looking at is computer power. A friend that does capacity planning estimates laptops being left on and not used or used for typical office tasks draw 50 watts (~1kWh per day), desktops 200 watts (~5kWH per day) and servers (running more or less full-tilt all the time with many disks) draw about 400 watts (~10kWh per day). Around here, that means two desktop computers left on all the time cost about $500 per year.