There is an aviation IRC channel on IRC some place, i chatted to a Canadian 757 pilot who told me reasons B757's are better than A321's.
Its on the default server on MIRC? Not sure of the name, it was some time ago.
To practise ATC calls then couldnt one use VATSIM?
Pretty neat idea, talk to a computer atc via voice recognition, get some feedback on atc calls, however, i think PPRUNE has enough problems with servers just running a BB/Forum, the extra server costs, development costs would be a nightmare for people who have full time professional jobs.
IRC specific for an area of GA would be good. But having PPRUNE put on IRC would need the same ammount of channels as the forum has boards, otherwise, things would get confusing with what, 3000 users on average on this site.