I was just wondering if it would be possible to run another Linux distribution (e.g., Arch,) in a chrooted environment.

What got me thinking about this was the Ubuntu distro, Crouton, which runs in a chroot on Chrome OS. It would be nice to be able to find my way around Arch Linux without having to reboot the computer or deal with the overhead of something like VirtualBox. (Also, it seems that VirtualBox can't emulate x86_64 architecture, even when installed on a 64-bit system; it's something to do with my Motherboard and BIOS..)

Even if using chroot in place of full-on emulation is impractical, one of the major tenants of Linux is the "why not?", and this would definitely be an interesting experiment.