VirtualBox came to Oracle from the Sun acquisition who acquired InnoTek. I really have always preferred VirtualBox over VMWare player, if you are playing the game of many VM's open VMWare player just is not so fun (I usually am running 2+ virtualbox all the time on my main system, not counting secondary systems). It really is the software I am turning to constantly, ever since I was looking for something easier to use than qemu around the time VT extensions hit the Pentium D.

We should convince the VirtualBox devs to do an AMA or a conference tech talk. Not only is it deep tech, I get the feeling it is a small number of really strong devs running the show (and possibly being ignored by the beast). Their networking options are also fairly awesome IMHO. I guess I'm a VirtualBox fanboy :)