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ZFS is one of the most interesting things to come out of Sun recently and is a much needed tune up to the Solaris filesystem. Journaling UFS, although not bad, is not my first choice as when the power goes down, you might still end up losing data or making the system unstable. Also, considering ZFS's scalability, I think they are on too a winner here.
I'm glad FreeBSD has been able to incorporate dtrace as well. It seems to be making a great OS even better. Kinda got me thinking about using it for a home server.