Is there any way to get Compiz'z fancy graphics to work in a VirtualBox VM.
...and would it be too slow via a virtual video-card?...
Is it possible to actually hook into the Host's own physical video card? .. or maybe use a second dedicated physical video card?
JanC's method works fine for me.
I had already installed virtualbox-guest-addition ... (I'm using Lucid)
To uninstall this VirutalBox Addon pack, run its installer with uninstall added to the end of the command line. (the other packages JanC mentioned seems to replace its functionality)... In my case the command was:
sudo VBoxLinuxAdditions-x86.run uninstall