Before stating that Chromium OS does not make sense and cannot be motivated, it would be fitting if you at least read up on what the goals of the project are. My understanding of it is that Chromium OS is intended for netbooks with an extremely fast boot time and a new take on system security (using mirrored system partitions that are updated one at a time, and so on). You may want to look through the Chromium OS web site (http://www.chromium.org/chromium-os), especially the videos related to security and boot speed. In short: Chromium OS might not be a better replacement for your current Linux/Firefox environment, but it may be a fitting solution for a different type of need. I can certainly imagine a ChromeOS-based laptop as a second computer, to bring on the road with me. Especially if it has some sort of 3G broadband built in.