What KDE version do you have ? The integration may work with the latest of the KDE (KDE 4.8)
The KDE is having the Nepomuk. Trueg is blogging of the integration between the KDE Activity Manager, Nepomuk, and Zeitgeist : http://trueg.wordpress.com/2011/06/06/randa-and-ontologies-and-whatnot/
A bug report: https://bugs.launchpad.net/ubuntu/+source/qtzeitgeist/+bug/914923:
qtzeitgeist is requested by Phonon and kde-runtime to add zeitgeist
It is a wrapper library around the Zeitgeist DBus API for Qt
It conforms to everything needed in UbuntuMainInclusionRequirements as
far as I can see.
Description: wrapper library around the Zeitgeist DBus API for Qt
Zeitgeist is a service which logs the user's activities and notifications,
anywhere from files opened to websites visited and conversations, and makes
this information readily available for other applications to use. It is also
able to establish relationships between items based on similarity and usage
libQZeitgeist is a wrapper library around the Zeitgeist DBus API for Qt.