Also, back to the whole extreme- gyaru style discussion, someone had recently posted this interview on a gyaru forum that might be interesting to read. It pretty much backs up what I said about the whole "ganguro/manba was basically attention-whoring" thing. Once the ideas of old-school gyaru started getting attention from media, that's when all the crazy s**t started. Now however, the style's going back to normal.
There's also a tiny bit into the whole discrimination of even the normal styles, and "enjo kosai" (compensated dating).
Even though it was most recently posted, it seems that the ex-gal was interviewed around 2000-2001ish. It says nothing about the evolution of ganguro --& manba/yamanba and such, nor how the style is now.
http://www.hellodamage.com/top/?tag=gonguro