For news about kdesvn see now http://kdesvn.alwins-world.de
kdesvn is a subversion client using the native subversion delevelopment API instead of just parsing the output of the commandline tool like most other clients do.
It tries to setup a look and feel like the standard filemanager of KDE and is integrated into it via KPart.
The base C++ interface to subversion I took from the (real great) tool Rapidsvn (see http://rapidsvn.tigris.org/) with some modifcations and fixes.
When interested in getting the source from scratch:
(do a git clone http://anongit.kde.org/kdesvn)
Comments are welcome. You may use the bugtracker https://bugs.kde.org/enter_bug.cgi?product=kdesvn
for reporting bugs or request features missing.