My buddy Rich Johnson (nixernal) already blogged about Kubuntu Documentation for Jaunty (spec can be found here). One of things we are focusing on for this release is KDE 4 documentation that is upstream for us.
If you are interested in helping out at with KDE docs, join us on freenode @ #kde-docs. Even if all you can do is send a text file to myself or Rich Johnson (email@example.com) and we will put it into docbook format.
Thanks for the help,