I like the idea of deep integration with MX.
I agree with you on allowing track links, as long as people tell why they're linking the track. Otherwise it is indeed just spam.
IRC will never take off among the majority here, and I know that. But for those that wish to use it, perhaps it will suffice until something better comes along.
On the #tm-exchange channel that Piercy set up for TMX United, someone had a bot there that would tell author, number of awards, comments, environment, mood, etc... when you pasted a link to a specific track.
It was quite handy, because you would get some details about the link before clicking it. Maybe it was even Piercy who made it. I'm not sure.