I have been using VirtualBox on Mac and Linux for a couple years now with fantastic results. Easy upgrades and free as in beer and (most of it) as in speech too.
Recently started using Vagrant http://vagrantup.com/ to configure virtual machines with VirtualBox and Chef. Awesome. I recommend this combo to all devs.
Recently started using Vagrant http://vagrantup.com/ to configure virtual machines with VirtualBox and Chef. Awesome. I recommend this combo to all devs.