Every few years, I come back to this question; for the first time, though, I've got a different answer.
When they make an animated movie of FurryMUCK / Second Life / The Internet / Your Favorite Tabletop RPG, who should voice your alter-ego?
For years, I wanted Kelsey Grammer for Athelind, but I think Your Obedient Serpent has finally moved past mere self-conscious pomposity.
Just as jirris_midvale wanted someone who could swing between the two poles of his personality, I've found someone who can capture the full binary range of Athelind's psyche:
When Athelind is up, he's impassioned, sincere, and inspiring, much like Cullen's most famous role.
And when he's not ... Cullen has that covered, too. You can just hear him say stuff like "any day where you don't have brain damage is a victory", "so far, so good", and other, similar gems from my Argot entries, can't you? Really, some of those only really carry their full weight as Athespeak when said in that voice.
As always, comments are open -- who's your voice?
Edit 05 June 2010: You know, when I think about it, Argot entries tend to be in Eeyore's voice, while Feed Your Head entries lean toward Prime.