I was about to open another topic about this matter because I didn't see this in the first place. why is it so difficult to put some relevant information in the topic subject ? it is what it is here for I guess. I'm sure many others will open redundant topics too because they'll miss this.
anyway, here's the official announcement from google
http://googleblog.blogspot.com/2009/07/introducing-google-chrome-os.html