I publish an e-newsletter and website on this very topic.  I aggregate events of all kinds and great ideas of things to do and places to go all over the Bay Area.  www.kiddiekoncierge.com.  There is also an extensive resource section and travel recommendations for families with children.  It has been featured in the San Francisco magazine as a great resource for parents like us.  Just published a 2009 Egg Hunt Guide and a FREE Cal Performances ticket giveaway.