Is anyone here running Karmic in a VirtualBox guest. If you're using the OSE, there is a package in he repos that you can install in the guest instead of using VB's additions. The package is called virtualbox-ose-guest-utils. I have reported 2 bugs against this package:
Shared folders and shared clipboard work fine.
In Jaunty, the video worked and the mouse didn't. In Karmic, the mouse nearly works, and the video doesn't.
I think if this package was cleaned up, it would be easier to install than Guest Additions, and could be added to a Live CD.