CherryPal Cloud-Ripe?

The Asus Eee PC was a precursor of this idea:

The C100 runs an embedded customized version of the Debian Linux operating system, but the machine's makers say its main operating system is the Firefox Internet browser.

"The operating system is not exposed to the user. So the user experience is, you turn it on, fire it up and then you see the log-in screen, user ID and password. The next thing you see is the mandatory landing page -- the Firefox browser," Seybold told TechNewsWorld.

All system-related commands are accessed through the browser, and all applications are loaded via the browser, he continued. "The operating system itself is not exposed. That's for two reasons. One is that people don't like the idea of Linux because it has a geek reputation, the other reason is that it [allowed us] to reduce the overall footprint of the OS, and that has a direct impact on the overall performance and the perceived user experience," Seybold explained.

I'm sure we'll be seeing many more such systems.