Mac OS X as guest on VirtualBox with Ubuntu Host?

"VirtualBox can't currently run OS X, but is slowly moving in the right direction. Version 3.1 has EFI support, which would be the first requirement for running vanilla (non-hacked) OS X Server as a guest. Keep an eye on this topic in the forums for updates.

VMware can, with some fiddling, run recent OSx86 (hackintosh) distros. VirtualBox can apparently just about run an out-of-date Deadmoo hack, but it's probably not worth it for testing software on OS X as the results are very unstable."

"This method to run Mac OS X as guest on virtualbox with Windows, worked well. I tested and used. http://www.sysprobs.com/install-mac-os-1055-leopard-virtualbox-314-installation-dvd

This method doesn't require installation DVD, just download the VMDK file and use with Sun VirtualBox"