An Easter (Egg) Holiday?

updog asks: "With Easter just around the corner, what better way for folks to celebrate than finding their own Easter Egg? While many people have seen the classic Excel Flight Simulator, there are over 10,000 other Easter Eggs found in DVD's, books, and music — for example, there are over 8 eggs on the Futurama DVD; and some hidden emoticons in Skype. What are some of your favorite Easter Eggs?"