DayOne Center
DayOne is a wonderful San Francisco resource center for new and expectant parents offering education, merchandise and community to support new and expecting families. DayOne offers workshops

ParentsPlace
ParentsPlace is a community resource center offering workshops, professional advice, family counseling and peer support group.

GoCityKids
GoCityKids gives you shortcuts to the San Francisco Bay Area at its best — its parks, stores, professional services, restaurants, babysitters, places to stay, and entertainment, among other things. It also offers a calendar of child-friendly events.

SF Gate
The San Francisco Chronicle web site has a calendar of events that displays local kid's activities.