I know that Gerhard Kulzer work on digiKam handbook (version KDE3). I think he will backport handbook to KDE4 soon.

Gilles Caulier

2008/10/19 Federico Zenith <federico.zenith@member.fsf.org>
I noticed that digiKam is supposed to be released in December, yet the
(lengthy) documentation has not yet been ported from the KDE3 trunk branch.

Is there a plan to do this, or will digiKam's first KDE4 version be without a
manual?

Cheers,
-Federico