In February I tried to upgrade Amaz0ns to a platform that would let us mimic Yahoo Groups, so that people would be able to set up their own sub-groups within Amaz0ns. The software implementation failed and I reverted most of the changes. (Except the theme and some other small upgrades.) So I'm hoping to have time next month or in January to try again - a lot of the software available has advanced significantly.
So maybe in a few months people will be able to set up their own groups here.