Chrome OS Stable channel has been updated to R12 release 0.12.433.257

Chrome OS is an open-source project that aims to build an operating system that provides a fast, simple, and more secure computing experience for people who spend most of their time on the web.

Google has been updated Chrome OS Stable channel to R12 release 0.12.433.257 including latest Chrome Stable release (Chrome 12.0.742.112 Stable), new flash player and several stability and functional improvements over the previous release.

What's new in Chrome OS Stable R12 release 0.12.433.257 (July 13, 2011)
In addition to all new Chrome 12.0.742.112 Stable new features, there are several great Chrome OS improvements as listed below:

• Flash 10.3.181.35

You can find full list of fixes that are in Chrome OS R12 in the chromium-os bug tracker.

Source: Chrome OS Stable channel Update