I spoke at this mini-conference on Monday with two others, Dennis O'Connor (CA State Senate Committee on Natural Resources and Water) and Kathleen Van Velsor (Environmental Planner and ex-member of ABAG). The session ("How We View and Value Water") was moderated by Ed Quevedo (Paladin Law Group), and Ed was free with his comments (you will hear him too).
Here's an MP3 [52 min 18MB] of our three talks.
Here are Dennis's slides [PDF].
Here is Kathleen's powerpoint [PPS].
Here are my slides [PDF].
Before we spoke, Bob Wilkinson gave a great keynote [29 min 10MB MP3], and Will Durst did a funny (really!) monologue [13 min 5MB MP3] about water, politics, etc.
Bottom Line: Price. Everyone was talking water prices, and Silicon Valley will be sustainable when prices are.