DocBook sounds fine to me presuming that the tools are validating (ie users
who just type nonsense into their text editor will be rewarded with a
screenful of errors) and so we get some decent structured documents, not
the hacked-together nonsense you usually get when people write HTML.
I don't know DocBook, but presuming all I need is some web tutorial and
a bunch of RPMs I am willing to learn it and submit documentation for all
file formats maintained by me or unmaintained + a bonus section for all
the Gimp newsgroup users who ask..
"There are so many file formats, which should I use?"
... to which the answer is of course always use PNG :)
Writing this stuff will take some time, how much time do we have?