Status of ZFS

I realise that ZFS is still experimental, but I've not seen any updates for a while. And I haven't seen any complaints for a while either.

Does anyone know the status of this port and how far down the road it is to becoming stable?

the updated ZFS is being put in -HEAD. So you could look at the CVS web for -HEAD to see how far it's coming along but from what I hear ZFS in -HEAd is much more stable then the one in 7.x