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VirtualBox, The Free Virtual Machine
I was using VMware Fusion a while before I discovered VirtualBox. My intention is purely to test my web application on IE6+. That’s the reason why I would rather go for VirtualBox as a free, more lightweight and faster Virtual Machine developed and continuously enhanced by Sun Microsystems.
VirtualBox has a lot of similarities to VMware Fusion or Parallel in term of functions. However, from what I observe, VirtualBox is much faster and consumes less memory than VMware Fusion as well as Parallel. You can download and give it a try at http://www.virtualbox.org.
If your intention is like me, to use a Virtual Machine software to test your application on IE6+, VirtualBox perfectly suits you. Although VM Ware Fusion and Parallel are racing for the number of functionalities, VirtualBox on the other hands, try to optimize the speed and add in reasonable functions to suit with the basic purposes of using a virtual machine.
Yet another great thing about this open source application is that it can run on other operating system as well (e.g. Linux, Windows and Solaris).
Here is the starting point of VirtualBox.