Stop being such a technology fanboy. Go ready up on the limitations of ZFS:
http://en.wikipedia.org/wiki/ZFS#Limitations
It has missing functionality such as encryption support and it does not seem to be a good fit for systems with removable media. It is also counterintuitive for the average user to grasp the concept that drives are part of a "pool". Finally, it is prone to fragmentation.
Given all of the problems and lack of completeness, I cannot understand how anyone in their right mind would advocate using ZFS for any system at this time. I think that ZFS, should it continue to be developed, could be a useful FS for a SAN device but I don't see it as ever being a good fit for a desktop OS.
Seriously, you fanboys need to stop jumping on the bandwagon of every new technology you hear about. ZFS is not an end user filesystem.
Nobody here has given a single valid reason to use ZFS over HFS+ on a desktop. I'm looking at you "I WAS the one". Your one line comment did not tell us anything.