I just came across this great David Lebovitz post: "Recipes To Use Up Leftover Egg Whites."
I figure people might want to see dessert recipes sans egg yolks- not only just because they might be left over. Some people might want to cut their cholesterol, and some people might just be tweaked about the yolk being baby chick goop. Or maybe some people just use up their yolks doing, uh...egg tempera painting?
Lebovitz's entry has so many nice yolk-less recipe ideas, like souffles, macaroons, pavlovas, marshmallows, etc. Check it out, and peruse his site if you have time...it's pretty great.