Here's a plant I first noticed that was planted along a parking lot at a strip mall in Orange County, and I saw it again recently in Presidio Park, in San Diego, in San Diego County, both counties in Southern California, so I assume it's a common landscaping shrub. It has pretty purple flowers with 5 petals apiece, with yellow centers. It has distinctive orange berries, too.
It took me a while, but I finally found a photo of Lycianthes rantonetii with a berry: http://commons.wikimedia.org/wiki/File:Lycianthes_rantonnei_Frucht.JPG
None of the Plant Files pics of that species showed the berries, nor most of Google images I found, which really surprised me, since to me the berries are what made the plant noticeable. Without the berries, it's just another plant with a purple flower. Maybe most everybody's photos of the berries turned out as blurred as mine? I'll take some more such photos another day, and maybe include these in the Plant Files to help others.
OK, thanks both of you, I'm convinced that's the correct species now.