I'm not into treating girls any differently then a boy. A lot of people act like little girls are sweet delicate flowers that can do no wrong. If they talk back it's cute, if they scream for a toy they're "a woman who knows what they want". I want my little girl to grow up to be a queen, not a princess. She has to make tough decisions, give up her own wants for the needs of her kingdom, stand up for herself with logic and skill - not tantrums, be confident in her inner beauty as much as the outer, and understand that she has to play by the rules as much as anyone else does.
I think spoiling anyone is wrong, girls included.