Awesome. Can I use those to upgrade an exisitng 8.04?
Not really, but you can follow the instructions here to upgrade from your 8.04 installation: https://wiki.kubuntu.org/Kubuntu/Kde3/Karmic#Upgrade%20from%208.04%20%5BHard... %20Heron]
I know, but the idea of not introducing any kde4 packages into the system intrigued me.