Just to say hi to other New Zealanders on this new forum, and to point out the mythtv-nz mailing list for those with peculiarly NZ related issues or questions.
I have been using mythtv for many years, fiddling to start with and probably since about 2005 in full time 'production' use. I have a backend accessing 2 HD Homerun dual tuners (so a total of 4 tuners). It has 2TB of disk for recordings, and a whole lot more for ripped video material.
I have currently 4 frontends (lounge and three bedrooms), with a spare set for a room we aren't currently using.
I also run XBMC on the 4 frontends as the whole family appears to prefer it for non-recorded (ie ripped) video material.
Anyhow, the mythtv-nz mailing list can be joined at http://lists.ourshack.com/mailman/listinfo/mythtvnz and the archives are at http://www.gossamer-threads.com/lists/mythtv/mythtvnz/ (Those of you on the other mythtv mailing lists will recognise those very useful mailing list archives run by gossamer-threads, many thanks to them).