You are eager to try out Chrome OS but don’t want to install it on your productive system? Well there is a great VMWare Virtual Appliance compiled by Mark Renouf. But what if you prefer VirtualBox over VMWare? That was my point exactly so here is what I did to get the image to run under VB:

1. Download the Image from here.
2. Install Qemu

3. bunzip2 chromeos-image-999.999.32309.211410-a1.vmdk.bz2

4. qemu-img convert chromeos-image-999.999.32309.211410-a1.vmdk /tmp/chromeos.bin

5. VBoxManage convertdd /tmp/chromeos.bin chromeos.vdi

6. Open VirtualBox
7. In the Virtual Media Manager add the created disk image
8. Create a new Virtual Machine and add the disk you just added
9. Start the Virtual Machine.

Now you should be able to start the VM and you are ready to go.