She's beautiful! So is her mom and dad, I love palominos!
I'd also like to hear more about this palomino thing, I didn't see anything on the links posted, and I've certainly never heard of it.
What is it related to? The creme gene? So are buckskins also affected? What about palomino to cremello? Or Cremello to cremello? Personally I'm skeptical, like I said I've never heard of it. I have heard of something similar w/ roans, although I don't know if that has been proven either.
Lethal white is a pinto problem, frame overo to frame overo.
Statistically w/ palomino x palomino (I think this may have already been mentioned) your chances are 25% sorrel/chestnut 50% palomino and 25% cremello. We ended up w/ a sorrel w/ our palomino to palomino breeding.