> If somebody could please, please, please figure out a way to have a voice-interactive AI dungeon master for playing DnD, I would be so happy..
That's an AGI problem. And if you constrain it enough to be solvable without AGI, what you end up with is a computer RPG, or a text adventure, both of which lose the "you can do anything and don't have predetermined choices" aspect of D&D.
I would go as far as to say that "DM a Dungeons and Dragons game in a manner indistinguishable from a good human DM" would be an effective Turing test.
For those of us who grew up playing touch-tone chose your own adventure games, something even slightly more sophisticated would make for a most enjoyable extended bath. AGI need not apply.
I'm not aware of any defacto place in the way there was in the usenet days of rec.arts.int-fiction [0] (although there is still a raif Google group [1])
There are local meet-ups and groups in various places (e.g. London [2], Boston [3], Bay [4] - run by Dan who's a HNer).
Parser-based interactive fiction has been overshadowed a bit in the last few years by choose your own adventure style. And forums/blogs generally seem to be a bit of a fading medium. But there are still players and writers out there. There's a knot of folks on twitter, of course. Lots of energy in the hobby is focussed on the competition: ifcomp.
If you want to have a go I tend to recommend people start with Inform 7 [5]. If you're a programmer it's also a fascinating language design, though TADS [6] is more conventional.
If somebody could please, please, please figure out a way to have a voice-interactive AI dungeon master for playing DnD, I would be so happy..