I'm going around the wiki and the forums and I feel like a lot of the information is scattered.
I think basic, simple things like how to install a plugin etc are missing. Maybe changing the wiki into a more detailed, organized frontpage would be good because it always looks like I can't find it myself on the wiki but it's there and I get the link in the forums.
I know this is probably not a nice thing to say or to compare to, but the WordPress wiki is very intuitive and detailed. I'll be willing to help writing them (once I learn how do to some of those things!