Burst Angel would have been more elegantly named Bust Angel, as it was very much about underage busts, as well as being a bust. I saw the first episodes of 009-1, but I remember nothing of it.
As for ADV, they survive as several different companies now (wiki lists them as Sentai Filmworks (licensor), AEsir Holdings (rights management), Seraphim Studios (localization), Valkyrie Media Partners (runs Anime Network), and Section23 Films (distro/marketing)).