Perhaps from the feminism desk, I love this story from the New Scientist :
Male monkeys prefer boys’ toys.
Apparently, if you give baby monkeys toys to play with, the boy monkeys prefer trucks and other wheeled vehicles, while girl monkeys go for both dolls/plush toys and vehicles.
So you can stop feeling bad about socializing your boys to play with "boys’ toys." That’s just what most boys do.
Watch the awesome video as well. Yeah, I’m a sucker for monkeys, toys, and gender issues.