Virtualbox on openSUSE 11.2

* make sure virtualbox-ose and virtualbox-ose-kmp-desktop are installed, they come with the OSS repository

* the first time Virtualbox OSE is started from the Startmenue -> System a pop-up window informs you:

"You are not a member of the "vboxusers" group. Please add yourself to this group before starting VirtualBox. You could do it using: Yast / Security and Users / User and Group management. Don't forget re-login your user account!"

* add yourself to the vboxusers group -> YaST -> Security and Users -> User and Group management -> choose the user you want to add the group to and enter "Edit", in the next following dialog, under "Details", vboxusers is one of the "Additional Groups" and can be selected.
or on the command line enter: groupmod --add-user vboxusers

Now you have to logout and login again so that the changes take effect.

* start Virtualbox OSE and in my case it converted previous configuration files over. The virtualmachines from my previous opensuse 11.1 installation were still available

I was able to start a SLES11 Virtualbox previously installed under Virtualbox openSUSE 11.1 right away.