I really enjoy using Sunforgettable by ColorScience. It's a Zinc Oxide powder and comes in a stick/brush that is refillable. It is spendy -- ~$50 for a tube -- but that tube lasted me all summer, brushing the exposed parts of two kiddos daily before summer camp, and I like that I get better whole-face coverage -- it's hard to get under their eyes with creams.

http://www.amazon.com/Colorescience-...DateDescending