VirtualBox is deceptively simple yet also very powerful. It can run everywhere from small embedded systems or desktop class machines all the way up to datacenter deployments and even Cloud environments.
Installation:
Click openSUSE 11.1 / 11.2 i386 | AMD64
This will download the YMP file and open it automatically with YaST Package Manager. The fist screen will prompt you to add the VirtualBox Repositories & openSUSE update repositories. Click Next.
In the next Sofwtare installation window, click Next. And, again click next on the Summary window which informs of you of the addition of repositories and the installation of VirtualBox software. This will download and the repositories, then install VirtualBox software and required dependencies including the kernel module for VirtualBox (virtualbox-ose-kmp-default). Click “Finish” in the final installation window.
You may also install the additional packages virtualbox-ose-guest-tools xorg-x11-driver-virtualbox-ose for video and mouse drivers for Xorg X11
To install additional packages,
From Computer, click Install Software and search for virtualbox. This should showup the above packages, select the packages and click Accept to install the packages. That should install all the required packages.
Once installed you’ll need to add your user to the vboxusers group, which can be done using:
sudo su -c ‘usermod -G vboxusers‘Note: You’ll have to log off, then log back on for the group memebership to take affect.
Starting VirtualBox for the first time will lead you to the default VirtualBox Console window. From here you can control the Virtual machines, Virtual Disks, Edit settings of Virtual machines including adding/removing CDROM/images, changing network settings like NAT, memory Hard disk etc.
source:http://linuxpoison.blogspot.com/2010/04/135781677519813.html