The WWF site has some great before and after pictures of Toronto during the hour.
Fortunately for me, I was at a birthday party for a friend and was able to participate with a bunch of people instead of sitting alone in a dark apartment for an hour (note to self: buy a flashlight or candles or something).
We ended up playing a really fun game (yes, I found a game fun, believe it or not) so our Earth Hour looked something like this:
