The lack of activity in the "Announcements" area causes me some concern. Linux ZFS just shipped an upgrade, FreeBSD is upgrading as time moves on but nothing since January in Announcements from Zevo. How about at least "We plan on continuing with Zevo" or "Its a free product - and is going to stay as is".
Don't know how I feel about long term commitment to Zevo given the silence from GreenBytes.
BTRFS is an alternate file system that is showing some life under OS X and provides most of ZFS functions.