There's something weird about the hardware specialization with chromeos though. About fall 2010 I accidentally my whole win 7 notebook and installed a copy of chromeos onto the harddrive before switching to arch Linux. Twas terribly slow and unresponsive, but this may have just been because of it still being a sec build not designed for a dualcore lenovo box.
Happy to report CR-48 is much more stable and fast with latest daily images.
There is a 64 bit kernel floating around but I haven't tried installing that yet.