Here's a pretty good summary:
http://zknives.com/knives/articles/law/caknifelaws.shtml
It's updated as of 10/31/10. I recommend reading for yourself the sections of the Penal Code that are cited. You can find the updated Penal Code here:
http://law.onecle.com/california/penal/index.html
It's important to read an updated Penal Code. Many sources out there don't update.

Below is another summary, but it's old and has at least one mistake that I found:
http://www.ninehundred.com/~equalccw/knifelaw.html
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If you're reading this, it's too late.