http://www.4amlunch.net/SMF/transmission-daemon
Note: This is just something I threw together quickly so it's not the prettiest thing around.
Installation is simple, just run:
# ./install_smf
and you are done. The script takes no arguments.
For now it just installs into /lib/svc and /var/svc. Maybe one day I'll re-write the install_smf script to be able to install into an alternate location.