I don't know where to post, so I post this here.
There is a strange behaviour with nepomuk. I choose to index many files. In the first time, it takes much time to index it all. After this, each time I start a KDE session, it rescans all the folder again. I'm quite afraid of my disk usage, and also that nepomuk takes much CPU during sometimes. Is that normal, because, when the data is indexed, it's OK, no need to rescan it again ...
Did you encontered this "bug" too ? Did this problem reported upstream to KDE ?