Sounds like porcelain berry, Ampelopsis brevipedunculata. It's a rampant grower, and needs a big support, like a chain link fence. It spreads rapidly by seeds. It likes part to full sun, and needs watering during the summer. I've never grown it in California, but it's trying to take over my garden in Portland, OR.

Glad I asked - it is porclain berry, and its invasiveness looks like a real problem. I planted it in a bed surrounded by concrete and fences, so I am pretty sure that is the best place for it. Too bad it is a pest, it is so pretty.

OK. I found these great-looking berries on humongous (30'on trees) vines when out on the Folsom bike trail. It looks like this porcelain berry except all the photos I could fine of that showed shiny leaves. This is very similar, but soft and nearly velvety, not shiny at all. Berries tasted (tasted and spit out of course) pretty much like blueberies. I saved a bunch but am afraid to eat them....any ideas?