I joined the project to work on Administration Guide 10 days ago, but before start writing, I'm getting skills on emacs, doc book and knowledge about Red Hat documentation rules and other issues. If you want, we can split topics and write the manual together.
I'm not sure how far my skills will stretch with regard to admin tasks, my level of ability is more desktop and some lighter admin tasks - though I like to think improving all the time :D I'm quite willing to help out however I'm needed with the admin guide though so if you do need any help post here and let us know! Jon