My parents took it to a shop today, and upon my suggestion, had the CV joints inspected as a potential cause of the noise. The shop said that it was, and that the half-shaft(s?) would need replacing. (Fuzzy on that detail- not sure if they recommended one or both)

Anyway, I ran across this thread tonight, and I think that could very well be my problem! The sound is from the passenger side only, and the fact that the shop said the axle needed replacing is a big indicator. Now that I've got this info(and pics from that thread), I want to go down to the mechanic that looked at it and see if that's what he saw inside.

Man, I wish I had a lift(or even some jackstands and a floor jack) so I could look at it myself.

Anyway, this is a cool new lead. If this is the problem, could making a spacer like Richard did in that thread fix my problem if the shaft isn't torn up too bad? That's what it looks like he did. I could fab that myself, too.