Here are patchsets adding support for libindicate to a few Qt/KDE applications.
Konversation:
konversation-1.2-20091019.tar.bz2
konversation-1.2~beta1-20090929.tar.bz2
konversation-1.2~beta1-20090928.tar.bz2
KMail:
Kopete:
This one is actually implemented as a plugin, but I had to extend the plugin API a bit so that plugins could control whether the application should quit when the window close button is clicked.
Quassel:
Support for libindicate 0.1.x is already in Quassel master branch.
quassel-20090928.tar.bz2 (integrated upstream)
quassel-20090916.tar.bz2 (integrated upstream)
Konversation:
KMail:
trunk
v4.3.0
Kopete:
Quassel 0.5:
This patch has been integrated upstream.