In my last post, I compared Windows VirtualPC to VMWare Player. I thought I would also try out Oracle's VirtualBox to see how it stacks up against the other two.
VirtualBox is in many ways very similar to VirtualPC. When you launch VirtualBox, you get a management window with your virtual machines in a column on the left, and configuration options on the right. From there, you can launch them in a separate window.
The integration tools install in the same manner as the other two (virtual CD-ROM with auto-run installer).
I like the default escape key of right Ctrl, since it's easy to find with my finger whether my fingers are using the keyboard or the touchpad of my laptop.
Anyway, I think VirtualBox is an excellent choice. Mouse performance was just as good as VirtualPC, and since it's an open source product, they have no reason to hold back full features like snapshots that aren't supported anymore in VirtualPC and that VMWare reserves for its Workstation product.
Because of these extra features, I would recommend VirtualBox over VirtualPC and VMWare Player.