I was wrapping some potatoes to make baked potatoes tonight and it reminded of a good tip about aluminum foil. Foil has a shiny side and a more matte finish side. The shiny side reflects light away from it and the matte side draws it in, so if you want to attract the heat to your food use the matte side.
Example: I used the matte side out to wrap my potatoes. If I were covering the edges of a pie so they didn't brown too quickly, I would use the shiny side up.