I came home to find a hot-off-the-presses copy of One Night Wilderness: San Francisco Bay Area by Matt Heid.
This just became my top reference for backpacking in the bay area. I think the trip descriptions are even better than his previous book, and the focus on overnight trips is a great help for our Boy Scout trips. There are plenty of good books about day hikes—you don’t get to a 10th edition without being great (that would be Tom Taber’s book).