us.dvorakr.kbd is missing from /usr/share/syscons/keymaps/
I found one on the web; but wonder if it's been fixed.
$ uname -a
FreeBSD carmen.opera 8.1-STABLE FreeBSD 8.1-STABLE #2: Wed Oct 13 20:48:24 MST 2010 neshort at carmen:/usr/obj/usr/src/sys/CARMEN amd64