Getting Raspbian running on a virtual machine can be very useful if you do development, or just want to play around. Easy to use solutions like VirtualBox unfortunately cannot emulate anything other than x64 or i386 CPUs, while the Raspberry runs on an ARM chip.
Enter Qemu, an open source virtualization host that can run on Windows, Mac or Linux and emulate a wide variety of CPUs, inlcuding the ARM chip that the Raspberry Pi is based on.
I have created an installer for Qemu that is preconfigured with the latest Raspbian image (Jan 2014) at the time of writing this, but still there are a couple of steps required to get it working 100%
File MD5: e323adcc7738b1948460b0e5fcb87a03