I have got a terrible obsession : Asian Ball-Joint Dolls (ABJD) or Dollfies.
What is ABJD ?
Asian Ball Jointed Dolls, sometimes referred to as ABJDs, BJDs, or dollfies (Dollfie is technically a term that should only be used to describe dolls produced by Volks, the company that brought out the first BJD in the late 90's). Never ever heard of it? Well, they are articulated using ball-and-socket type joints dolls, generally made from resin (there are some vinyl dolls out there), and strung with a strong elastic and are highly customisable.
So, where to find informations about dollfies?
The first place you should check is the Den of Angels forum FAQ : http://www.denofangels.com/sdfaq.html
You can also read the Wikipedia Dollfie page : http://en.wikipedia.org/wiki/Super_Dollfie
Here a collection of Bjds which I like.