I too started out on FreeBSD. Another feature that I don't think you mentioned, and don't know whether it's supported with ZFS was union mounts, where you can m

I too started out on FreeBSD. Another feature that I don't think you mentioned, and don't know whether it's supported with ZFS was union mounts, where you can mount one filesystem atop another (as many times as you'd like) and thereby get yourself a COW filesystem. I think there was a method to run FreeBSD from a CD-ROM using this?