I think Tom Costa's comprehensive Realms languages article from one of the Dragon Magazine Annuals had a whole bunch of dialects. In transit to GENCON so can't check just at the moment, but it would be the best place to start.
-- George Krashos
"Because only we, contrary to the barbarians, never count the enemy in battle." -- Aeschylus
This scroll has the Dragon Magazine specifics. It's a great, comprehensive article by Tom Costa and worth tracking down. In fact, I could see many people getting confused with the sheer numbers and combinatorial complexity of all the described languages and dialects listed.
My only observation is that British-sounding accents often indicate individuals are elite, intelligent, and competent. Whereas Russian-sounding accents typically announce an individual has an evil and warlike agenda. Just a popular Hollywood trope, but it seems quite inescapable.
That thread doesn't actually have much in the way of specifics and certainly not what I was looking for directly. Sleyvas' work is of great help though.
I have a dream that one day, all game worlds will exist as one.