While giving demos of Wonderland at JavaOne 2008, one of the common requests I heard was for more documentation about Wonderland. So, as a first step towards that I just posted a redesign of our wiki site (here). You can see that it’s organized around four different (and perhaps overlapping) kinds of folks that would use Wonderland: end users, system administrators, content developers, and developers. (I posted a description of each of these roles here). I hope this makes it much easier to find the information you are looking for.
And my next task is to get to work writing some more documentation — I’m already working on a tutorial that describes how to create new cell types in Wonderland (the main mechanism to extend its functionality). After that, I’m gonna concentrate on some more installation/configuration tutorials. But of course — I can always be influenced, so leave a comment if you really would like to see documentation in some particular area.