ChromiumOS64 is the new Chrome OS project that promises to make the chrome OS for the 64-bit CPUs. The ChromiumOS64 also features Xen hypervisor.

It also allows the users to the run virtual machines on Linux as-well-as Windows-powered machines.

Download size is mere 1GB. Note that it is a pre-alpha release

ChromiumOS64 is an unofficial port of the original Google’s Chromium OS project (when officially released in 2010, it will be called Google Chrome OS) to the x86_64 64-bit architecture. The original Chromium OS project does not support 64-bit platforms. This is because the majority of the netbooks in the market are based on Intel Atom processors, which are mostly 32-bit. It is highly anticipated that Google’s Chrome OS will debut in 2010, based on the open source Chromium OS project, which is itself based on Ubuntu 9.10 Karmic Koala GNU/Linux. Ubuntu itself is derived from Debian GNU/Linux. In turn, Debian itself is derived from Linus Torvalds’ Linux kernel.

source: http://www.chromiumos64.com/