In case anyone is interested, I've just made my 3rd beta test release of an
NFSv4 server (also does V2 and 3) for FreeBSD5.2 and OpenBSD3.4 available.
It seems prettys solid now, although there is still work to be done on ACLs
and sysadmin tools.

It is available via anonymous ftp from snowhite.cis.uoguelph.ca (131.104.48.1)
in pub/nfsv4.

Good luck with it, if you try it, rick