Google Chrome OS is a lightweight OS,What do you think of Windows 7 vs. Google Chrome OS? But in my mind Google might fail miserably. Windows 7 Will won finally.
There are some reasons:
1.Google Chrome OS is not a real OS and require less software.Although you are using Google Docs, Office, Mail apps etc.
2.when Google releases their Chrome OS, What do people think of its crappy backwards-compatibility.Many things will not be compatible with it.