Google has been developing a google chrome OS based around the framework of google chrome browser, The official, actually-made-by-Google Chrome OS will be for the net books till late 2010, but still you can try out a custom-built Linux distribution which has Google’s browser at the center of everything.
You can either choose to install Chrome OS to your disk with the live CD Image, or you can try out the of the virtual images, pre-built and ready for VirtualBox or VMware. Here are the download links to unofficial Google Chrome OS
Free virtual image of unofficial Google Chrome OS – Download Chrome OS 0.4.207 beta (x86) VMDK [ Run On Virtual OS through VMware or VirtualBox ]
Install Chrome OS on your hard disk using this Live CD image – Download Chrome OS 0.4.207 beta (x86) ISO [ Install On Hard Disk with this ISO Image ]
[ Via Google Sites ]