There are two slots for k9copy but k9copy-2.3.1 and k9copy-1.2.4 block each other. I find that rather strange.
kde apps will install into /usr/kde/3.5 soon. And this way you can block entire slot for ensuring that you will keep your kde3 version. I would close this NOTABUG but i cant :] So choosing nearest option.
I still doesn't understand why 2 version of k9copy belonging to different slot can't be installed at the same time.
François, to expand on Tomáš comment, until we move the KDE-3.5 misc apps to /usr/kde/3.5, we'll have to keep blocking them from the corresponding KDE-4 apps or we'll get file colisions on /usr. As of now, both slots try to install files with the same name into /usr, which will cause portage to kill the emerge because of file colisions.
Given my above comment, I'm closing this as CANTFIX. As soon as the eclasses are updated, we'll drop the blocks