Hmmmm .... seems a bit harsh to me not being able to discuss other relevant stuff. I've always thought that this was a pretty open place to discuss all manner of things!! It's a bit like inviting someone to a party but telling them you can't talk about anyone outside the party.
Anyway .... moving along .......
I think that there are benefits to be gained from all manner of forums. These range from specific focus sites to more generalised ones. I'm of the view that any photographer who doesn't access a wide range of sites isn't doing themselves any favors.
I have always been a member of a local camera club as well, and since doing so I have spent most of my time in some sort of role within that environment. You learn lots from entering competitions and receiving feedback, and having real-time conversations. Online groups such as Ausphoto are invaluable, but talking to real people in the flesh is a great way of improving your photography and social life. I agree that sometimes real world camera clubs can involve hassles if you get involved in the administration process - been there, done that. However, that shouldn't deter you from joining one.
Then there are web sites that offer in-depth technical studies of equipment and techniques - with resources way better than either Ausphoto or your local camera club. My point is, unless you avail yourself of all the available information you are less likely to extract the best from yourself or your equipment.
I don't actually know of any other competing sites to Ausphotography, but I do think we should be able to mention them if we do happen to know of any. The advantage of this site is that it is local rather than based overseas - that's important to me as we are, after all, mostly Australians here.