Peter, you have too many "nets" in there for POTN. It's
http://photography-on-the.net/forum/ Wonderful resource, very friendly and well moderated. Says it's Canon-based, but don't let that deter you if you use Nikon etc. They're very accommodating and you don't get Canon-bashed.
Aussie based
http://www.digitalslr.com.au/forum/ is quite good and to a lesser extent
http://www.potd.com.au/forum/?user=forum which I'm aware of but not as familiar with.
For my money, POTN is the best. Similar interface to IIS here also, so familiar feel. I didn't like Fred Miranda and DPreview interfaces for posting, although they are great resources to read.
For that matter, I personally don't like the interface at Cloudy Nights, but that's another story...