I wrote about keys in another thread down below, but here goes again. I´m somehow interested in keys:-).
Marissa O´Donnell, Rosanne Sorrentino, Brittny Kissinger and Sarah Jessica Parker (among others) sang Tomorrow in F. Andrea McArdle, Louanne, Allison Smith, and Alison Kirk (also among others) sang in F# (a halftone higher). I have not checked what key they used for Amanda Balon.
By the way, I love all theese girls renditions of Tomorrow, no matter what key they are in. They are all different and fabulous!