I read an interesting article from Pinker's perspective on some of the comments Summer's made. It's not very long, so you might want to read it for yourselves.
Basically Pinker thinks that everyone is getting mad at a hypothesis that men may have a "higher statistical distribution of spatial abilities than women". However, this, Pinker believes, should not drive or enforce the discrimination of women at an individual level. He's not saying it's proven to be true, but there is enough evidence to consider the hypothesis.