I don't know, I guess if I were to convert to Orthodoxy I would prefer to be re-baptised, since the significance of it was purely symbolic in the church I was in (that's what everyone believed), and that's what I was taught to believe about it. I would think that since baptism is a part of salvation (and since salvation is only found "within" the Church) I would think that logically they would want to have converts baptised within the Church. This reminds me of the baptism scenario in Acts where the individual didn't receive the Spirit because they were baptized under John. (Whom, as we all know, is the founder of the Baptist faith!
My dad actually tried to "convince" me of that once.
Well, that point leads me to a tie-in question. I've heard that only bishops perform chrismations in certain jurisdictions. Is this the true for baptisms also, and does this phenomenon occur in the US?