From the OSX Server mailing list:
<p>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.<p>Ten's Complement: http://info.tenscomplement.com/<p>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.<p>From his twitter (http://twitter.com/tenscomplement)<p>http://lists.apple.com/archives/macos-x-server/2011/Mar/msg00194.html
More discussion of this on the zfs-macos group, which was the community port of the available apple code and updates from opensolaris:<p><a href="http://groups.google.com/group/zfs-macos/browse_thread/thread/7832620cb31637ec" rel="nofollow">http://groups.google.com/group/zfs-macos/browse_thread/threa...</a>
Didn't Apple drop ZFS on OSX for fear of patent lawsuits?<p>edit: it looks like ZFS is clear: <a href="http://www.sun.com/lawsuit/zfs/index.jsp" rel="nofollow">http://www.sun.com/lawsuit/zfs/index.jsp</a>