I have not tried serving srv records fromplan9 but i do host my domain (quintile.net) from plan9, and I do use plan9 in a domain served by AD at work.
I (with some help from geoff) wrote zonefresh which sucks up a domain (using axfr) and spits it out as an ndb file. This could be useful to check that you are serving what you think you are. I use this to keep a local copy of my work AD DNS which I find easier to debug when problems arise. If you have a real AD server which you are trying to replace this could automate the process a little. Contact me off-list if you want to specifics. -Steve
