Did you end up participating in Earth Hour last week? We did, although we did ours on Sunday! I sort of forgot until the very last minute Saturday evening, so we pushed it back a night. Saturday, Sunday, it makes no difference, at least that's what I told myself.
As our Bachsters get bigger, Earth Hour has changed to not only turning off all the lights, but also unplugging. Thankfully, they really enjoy it, and we ended up sitting around the glow of candles, telling stories, reading books, drawing and making pillows (well, that last part was our craft-loving 7-year-old's contribution). And some of us did not quite unplug 100%, as there was a great deal of digital photography happening.
Here's the link to the Earth Hour website. And here's the link to our Earth Hour 2011.