Make sure all your utensils are completely dry. Meringues are sensitive little beasts, and they don't like moisture at all. Don't make meringues on a rainy or really humid day: remember they're mostly air, and if that air contains a lot of water, it has an effect. If you try this recipe in wet weather, your meringues will fall flat and burn. Really.
But... but... but I live in British Columbia! *wail*
Okay, now I'm hungry. And I need to go get milk. And... ice cream. And chocolate chips. And...
...crap. *goes to make list*