Hmm...
I live in the valley and I agree with whoever said that there are definite fashion borders between LA cities. Still, I think that it's the younger girls(ala Mary-Kate) who really rule LA street style, whereas in other cities, it's the slightly older twenty-somethings. IMHO.
There's alot of boho going on here, but that's happening everywhere. I think the style that's most unique to Los Angeles would probably be the imitation-celebrity look. I guess that makes sense since we DO live in the tabloid capital of the USA. There's tons of Nicole Richie/Paris Hilton/Mary-Kate wannabes everywhere, but I feel like nobody pulls it off quite as well as the Angelenos do. That might be because there's a lot of industry babies around here. Lots of kids of celebrities, and plenty of plain old rich kids.
I'll try to post pictures soon...