Your Child Talking: A fantastic resource center for parents who want to facilitate speech and language development for their kids. Lori, the speech pathologist who maintains the blog, writes in very clear straight-forward language and has even given me great advice in improving my own son's minor language issue.
The King and Eye: A mother of three children, one of whom has autism and amazing determinism. Here's a blog gem from her website:
Top 25 Mental Health Blogs @Circle of Moms: A list of blogs written my mothers who have battled all kinds of mental health challenges, including postpartum depression, anxiety, and bipolar disorder.