Hi.
Another SuSE forum is
SuSE Linux Forums (Powered by Invision Power Board) They have a more participants but I don't use either forum very much.
As a demonstration, I'm posting this from Firefox running on Solaris 10. However, the Solaris is running as a vm guest on a Debian Etch host, courtesy of VMware. In turn, it's being controlled by a link between the host and the VMware Console Server application and that is actually running on an AMD64 which is running Debian Sarge.
The VMware host has more than 10 VM guests, each of which is running a different OS, Solaris, BSDs, openSuSE 10.3, CentOS 5, etc. (but not usually running more than 6 simultaneously). I most often use the command-line interface, but every now and then I try the GUI (Desktop, window manager, applications) to see speed, features, etc.
I hope that you will get as much utility (and pleasure) from VirtualBox as I have had from VMware ... cheers, drl
(I just noticed that I have not installed the Google Toolbar in this Firefox, so please excuse mis-spellings.)