[citation][nom]killerb255[/nom]Maybe this could finally give Linux a decent amount of operating system marketshare. [/citation]
I'm not so sure, because...
[citation][nom]Shadow703793[/nom]So basically, this is just like another Linux distro. Distro's like these already exists, except by Google doing it more people are exposed (publicity) to it.[/citation]
It's NOT "just another distro." Nearly all Linux distributions today are based around the X.org graphics server. The glaring exception is Android, which uses kernel-level frame buffering instead. This means that programs or front-ends designed for X won't work natively on Android or a new Google OS without X. And just to clarify, that's the vast majority of GUI-based software available for Linux today. It'll be more work to port existing apps that modern Linux users "need" nowadays, like Open Office, WINE or Firefox.
So while it's arguably going to be a Linux distribution, it won't be "just another distro." Like Android, programmers are going to have to rethink their platform development if they want to support it. In this case it looks like Google is trying to nudge people towards web-based applications almost exclusively (i.e. a hosted service like Gmail as an email client, Google Docs or similar for word processesing, etc.). This is even different from the Palm Pre's webOS, where only the interfaces for the programs should to be built with web-style markup.
Personally I'm more comfortable with local instead of cloud-based applications (Gmail being the biggest exception), and this Google OS doesn't sound appealing to me at the moment.