Day two of running Kubuntu Hardy Heron revealed a minor issues: my VirtualBox wouldn't run. VirtualBox appeared to open up fine, until I selected one of my virtual machines to run. It tried to load it, but errored out because it couldn't find the VM files on the system. I'm sure this stemmed from the upgrade process from Gutsy Gibbon and how it rewrites files. The fix was really easy. I simply reinstalled the Deb package and alls good again!
Note: I use the Deb package directly from Innotek, not the one in the Kubuntu repository. At the time of this writing, they only had a Gutsy Gibbon version, but it seems to work just fine on Hardy Heron.