VirtualBox is actually fairly strategic inside big-O. They had to sort out its positioning vis-a-vis Oracle VM and "the cloud", as well as dealing with the usual wave of developers leaving (Oracle and Sun are very different cultures...) but I think they've since rebooted its development in earnest.
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VirtualBox has been on life support for the past few years, not seeing any major development since Sun got acquired by Oracle.
If the same thing happens for VMWare Workstation, I fear we're entering a dark age for desktop virtualization...
VirtualBox is actually fairly strategic inside big-O. They had to sort out its positioning vis-a-vis Oracle VM and "the cloud", as well as dealing with the usual wave of developers leaving (Oracle and Sun are very different cultures...) but I think they've since rebooted its development in earnest.
5.X just came out a few months ago. It's pretty good.