How To: Beat Egg Whites

I just posted a recipe, Country-Style Almond Cake, from a new cookbook called Food of the Italian South, which called for stiff egg whites. I was amazed in this recipe that is gluten-free, how much the egg whites gave moisture to the cake. So this leads me to think about this technique, and how people may not know much about and how it can improve recipes. To whip the whites is to...