I only took a quick spin through it to get some screenys, haven't tried running a .exe or doing much of anything w/ it yet.
This one I found is a "Live CD" type so one has to have the CD in the drive to run it.
The Get Chrome
site I found it at says its "Chrome OS is at the Release Candidate stage".
From their About Chrome OS
2010-12-07: New version of Chrome OS 0.9.576 RC is available for download!
Chrome OS is a brand new free operating system built around the revolutionary Google Chrome browser.
The project aim is to provide a lightweight Linux distribution for the best web browsing experience.
Featured software in Chrome OS:
•GNOME 2.30 desktop environment
•Google Chrome 9.0.576 web browser Updated!
•Google Picasa 2.7 photo manager
•OpenOffice.org 3.2 office suite
•GIMP 2.6 image editor
•Flash Player 10.1 plugin
•Wine Windows emulator 1.2
•Pidgin 2.6 instant messenger
•Dashboard in browser New!
•and much more!
System requirements of Chrome OS:
•Processor: Intel Pentium, Xeon or newer; AMD Duron, Athlon, Sempron, Opteron or newer
•RAM: min. 256 MB
•Hard disk: min. 1 GB
•Graphics card: supports most modern graphics cards
The download file size is 610MB & is very slow if not a subscriber (in the 95KB/sec range).
It also arrives w/o a file extension so one needs to add the .ISO to the end of it before burning it to a CD.
My Avast! AV scan showed it is virus free.