I've never kept them but am seriously considering it...here's one of the sites that I found. Look for caresheets and forums from the UK, since it's apparently been more extensively bred and kept in the UK than in the US.
http://www.geckosunlimited.com/commu...williamsi.html
I've heard a lot from a lot of different places, some of it conflicting...they do seem to need a high humidity, and males can't be kept together due to fighting and dominance issues, but apparently, they do well in small to medium sized arboreal terrerriums that can hold in humidity well. You can keep them in pairs and trios pretty well that way, but you have to watch out for the eggs; they don't care for the eggs, and the eggs can't be removed from the glass of the terrerium, and you have to cover them until they hatch, or risk killing the eggs by moving them. The babies have to be removed right away or the parents will eat them...that is, if you intend to get more than one.
I've also heard they have a nasty temperament, but I'm not sure on that one, as it was just hearsay. Anyone else got some information? Thanks!