There are enough features that they warrant you taking a look at this two-page VirtualBox Community Bulletin.pdf.  No point in me restating them.

If you and your organization haven't tried VirtualBox, or you haven't looked at it in a while, you owe it to yourself to give this a run.  This is small, simple, powerful, software that allows you to do way more than most people would ever need in hosting a Virtual machine on you local machine.  I routinely will do a demo on a two-year-old Macbook running OS X locally, plus a Solaris 10 VM running the Sun Ray server, and a Windows XP VM and hang a couple Sun Rays off of it - and the performance is stellar.

You can subscribe to the mailing lists and get access to the Beta releases as they come out as well, if you are into 'bleeding edge'.

40,000 downloads a day is the current rate (before this new release), but it will jump for sure now.  Might as well join in!