The Good Men Project has an excellent blog on masculinity/manhood. They just released a book The Good Men Project: Real Stories from the Front Lines of Modern Manhood along with a companion documentary film.

Daughters.com is a great site for advice, user content, resources specific to girls.

Daddy-Dialectic Blog Jeremy Adam Smith's blog is loaded with research, stories, all things dad-related.

Colorodo Dads Blog Rich Batten's blog has great insights and info for fatherhood programs, and dads in general