The NYTimes T Magazine has a great little article about the small army of teenage fashion bloggers that have sprung up over the past couple years (unfortunately it's trapped inside the awful T Magazine flash website).
I've been reading Style Rookie for a few weeks now, and I'm constantly amazed by the 12-year-old author's vision, creativity, and writing talent. A swear she's going to be the next Anna Wintour before she even gets to college.
I've been a casual participant, but avid observer of fashion since I was in junior high. And it's been inspiring for me to see how the internet - self-publishing and global communications - has totally broken the control that brands like the Gap had over national fashion trends 10-20 years ago. Young people now are inspired by street photography on Face Hunter and their peers on Flickr's wardrobe remix as much, if not more, than they are by Vogue and Cosmo.
Here are a the other teen fashion blogs that are mentioned in the article (all of them are worth checking out):
Childhood Flames - http://childhoodflames.blogspot.com/
Fashion Robot - http://thefashbot.blogspot.com/
Fashion Toast - http://www.fashiontoast.com/
That's Just My Vibe - http://thatsjustmyvibe.blogspot.com/
Fashion Pirates - http://fashionpirates.blogspot.com/