Two developmental psychologists (who were husband and wife) made observations of their own kids regarding gender stereotypes. These observations were done by them in the 70's, before all the PC stuff. The husband and wife attempted to raise their son and daughter from an early age in an a "neutral" home: meaning, they would not decorate their sons or daughters room according to specific colors or buy them specific toys according to their sex (boys get trucks, girls get dolls). Again, this had nothing to do with PC, as this "study" was conducted in the 70's (it wasnt really a study, just observations made by a husband and wife about their kids). The husband and wife specialized in researching gender roles and sterotypes, etc. They soon began to realize that, despite their attempts to raise their children (a boy and girl) in a neutral home, their son still preferred blue and still chose trucks, and their daughter preferred pink and chose dolls. Obviously, this was not a controlled study, but it does indicate that perhaps there is something very inherent that predisposes boys and girls for certain colors and toys. Via research, we already know there are distinct differences between the ways that men and women process language, emotions, cognitions, etc. But we also know via research, that both boys and girls play with toys that are made for both boys and girls. Growing up, I played "house" with the girls on my block--played with teapots and shit like that. It had no negative effect on me, besides posting on getbig. At the end of the day, its probably best to just let your child choose the toy he or she wants to play with, instead of forcing them to play or not play with a specific toy.
At the end of the day, your kid is going to pick out the toy he or she wants to, independent if its in the boys or girls section. Its what they are interested in.