Wow, Daniel a lot of food for thought in your posts!
I have attended churches where on occasion one would speak in tongues and another would subsequently speak in English, apparently interpreting the tongues message. I've heard from hard-core pentecostals that true in-tongue messages from the holy spirit will be accompanied by an immediate translation, otherwise they are false. I've also heard that it may or may not be accompanied by translation. None of this have I been able to get out of any Biblical reading on my own. It just depends on the denomination and the particular sect of the denomination, and then on who is in charge (pastor/preacher, etc.).
The comparisons and possibilities of echolalia and glossolalia are pretty interesting. It would have been scientifically awesome if I could have hooked up everyone at the Charismatic catholic session including my aunt, to ekgs, emgs, and brain scans - wow, now there would be some fodder for discussion! All I know is, that session just somehow didn't seem right to me. Not in that I thought it was necessarily evil, more like they were just trying to hard to be spiritual. All over the place. But I've also experienced very controlled, very deliberate tongue-speaking in a pentecostal environment. I can't remember any instances of anyone recording these; however, at the CC session, my aunt did insist that I take pictures, which I felt were extremely intrusive and inappropriate, so after a couple shots, I put the camera down.
All that said, I've pretty much given up attempting to do any tongue-speaking of my own. I dont' believe it's a gift I'm meant to have.
"Struggle is a never ending process. Freedom is never really won, you earn it and win it in every generation."
Coretta Scott King