F: Where is my data?
A: It is stored in a xml-file in the kde4 standard dir for application data. Usually it is ~/.kde4/share/apps/silence.
F: Where is the manual?
A: Sorry, I did not have the time to write one yet. Feel free to write it and I would be happy to publish it here.
F: Are there packages for my Linux distribution?
A: Arch Linux users can find Silence in AUR. Thanks to the openSUSE Build Service there are packages for some distributions. You can find them there or at KDE-Aps.org.