Some points:
1. As others said, the PS3 doesn't use 380 watts. Its power supply is rated for that amount. This is a good thing! More overhead available means the power supply is less likely to fail. It was a nice bonus they put in that they really didn't have to, because as we've seen this generation, people will happily buy consoles even with substandard parts.
Actual tests with the PS3 early in its life put its power usage at somewhere around 170-200 watts. But, and this brings me to point two...
2. The power numbers floating around the internet are outdated. All 3 consoles (well, I'm not totally sure about Wii) have received redesigns on things like their chip size since those tests were run, which greatly reduce their power usage. For instance, a 40gb PS3 bought today uses only 120-140 watts. I haven't heard numbers on the 360 or the MGS4 PS3 (there are a lot of conflicting reports about whether it has the 65nm Cell or not. I have a hunch that the older ones don't but the newer ones might).
3. There's no such thing as "watts per hour." Watts are a measurement of power, not energy, and already take time into account (1 watt = 1 joule per second).
4.
This is true. But the Wii still isn't as ecologically friendly as it sounds. WiiConnect24 is ridiculously inefficient, it comes enabled by default on every machine, and it's mostly useless. It's like leaving a lightbulb (one of the new compact flourescents, mind you) on in a closet year-round.
