There are quite a few, but I'll only mention some that stick out in my mind...
Idina Menzel
Sutton Foster
Nancy Opel
Cady Huffman (sp?)
Mary Elizabeth Mastrantonio
Sherie Rene Scott
Bernadette Peters
I was also a bit disappointed, although not completely, with Beth McVey's singing portion of Urinetown on its tour. Nancy Opel really belted them out high...Beth kind of sounded low...if you heard both Nancy and Beth you would know the difference. Now, I am no voice expert, but what is head voice and chest voice?
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611