What is it that you're interested in discussing? A relatively simple search will turn up all of the threads you're looking for. If you still can't find it, write up an opening post here, and I'll turn it into a new thread if it's interesting enough.
The ZZ Gundam and G Gundam threads (blame Sunrise for their stupid titles
) are especially tough to find because of its name, so I grabbed the links for them:
Gundam ZZ Discussion and
G Gundam. There's probably a Gundam X thread out there as well.