We shut everything down a few minutes early - lights, tv, computer, left only the fridges running - and went and sat out the back yard. I had hoped to see a reduction in local lighting and wanted to be out there beforehand to see it happen.
As Jeanette noted earlier it was a surprisingly cool night around some parts of SE Qld (by comparison to the last 5 month anyway) and so the temptation was there to throw some pre-gathered wood into the cast iron firepit and have a bit of a cheery fire.
However we considered the lunacy of generating smoke/CO2 this way and disregarded the idea, in the end we sat there under a non-productive (ie hazy & foggy) sky and talked - just talked - for about 75 minutes.
The only active "consuming" we did was to briefly run LED headlamps as needed while sitting in my pretty dark back yard. I wish I could say that we used my brothers solar charger & recahrgables to run these, sadly the headlampsun AAA's and we don't have any rechargable AAA's yet.
Anyway it was a pleasant hour or so, quite peaceful and quiet and relaxing(there was some gentle music from the Earth Hour party across the road a bit, where all was in darkness).
I did have the idea (remember you read it here first) that the organisers of Earth Hour should have provided a 'poster' file on the website that you could download, print out, and display in your yard to promote awareness.
Something along the lines of "March 29th, 8:00 ... Our lights will be turned off to support Earth Hour 2008 - what will you be doing?"
I hope someone from Earth Hour / WWF reads this - get the posters ready for us for next year guys!
