Those are Asian Ball Jointed Dolls (ABJDs or BJDs) More commonly lumped into the "Super Dollfie" category.
I'm pretty sure that those particular doll heads were custom made by the owner and are on SD or SD10 bodies manufactured by the company Volks.
I would recommend looking at
http://www.gigglegeek.dk/bjd.htm for a list of a LOT of doll companies (but not all.)
Be forewarned: They are VERY expensive, so if you choose to get one, make sure you look around and pick one that you really want.
And for shits and giggles, here are some of mine.
heart
Luka
Enki
Deimos
I've got 13, so if you'd like to see more, just ask! I'm loaded on pictures of my dollies! (and other random doll pictures I've saved.)
You could also go to www.denofangels.com and go to the forums. The people there are real pricks most of the time, but they've got a lot of information.
I also run a guild about them so if anyone's interested, check it out.