Thanks, Julian's Momma. I'll look into that CD. And, might hint to DH about the "rain box" I mentioned for Valentine's Day! Oh, I think I just PM'd that bit of info... There's a box I've seen that has a magnet on the top inside and little balls inside; you just turn the box over for the balls to catch and then turn it back over for them to slowly drop, kind of like rain, I guess. If I see one again I'll post a link.
As far as white noise affecting speach... I'm not sure, but I know I read that too much television can affect a child's attention span as they learn to tune-out other things. So, that's not just about having to be entertained by technology, that's addressing the tuning-out which I'm guessing might have something to do with the white noise issue. Why it would affect them for sleeping I don't know at all.
Here's an interesting bit of trivia: Did you know that in South Korea it's thought that running a fan in a room while someone is sleeping can contribute to their death?! It's called a Fan Death. Here's a Wikipedia link: http://en.wikipedia.org/wiki/Fan_death
Just thought that was interesting and kind of related...