I haven't touched a windows box in many years. I've never used vista or windows 7.
Neither the iPhone nor WebOS ever expose a filesystem to the user. Neither Android nor WebOS expose Unix to App developers. Android doesn't even present a real Unix system to the OS developers!
This is bringing Linux to the masses in the same way that Mac OS X brought Unix to the masses—by hiding it under a pretty UI.
I suppose you can just think of Chrome OS and Android as just another couple of distros among the thousands already available. Same kernel, customized UI & apps.
Fundamentally, that's what Linux is about - a FOSS platform that anyone can modify and redistribute.
ChromeOS is better, it's just a spin of Ubuntu.
ChromeOS uses X Windows, just without a reparenting window manager.
ChromeOS is not Unix 'hidden' under a pretty UI -- neither the filesystem nor the userland are exposed to the user or to application developers. There's no Finder as the main UI with a Terminal in the Utilities folder: both metaphors are simply gone.