Don Brady, former senior Apple engineer has started a company to bring what appears to be a commercially supported version of ZFS to OS X.
Ten's Complement: http://info.tenscomplement.com/
Details are sparse, but they have a twitter feed and email newsletter. When I signed up I got a invitation to join the beta program.
From his twitter (http://twitter.com/#!/tenscomplement):
$ uname -prs
Darwin 10.6.0 i386
$ zpool upgrade
This system is currently running ZFS pool version 28.
Phil
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