Here's my list:

Xtina - Beautiful
Alicia Keys - Fallin', Karma, No One
Cheryl - Fight For This Love
Fergie - Fergalicious
Jamelia - Superstar
Beyonce - Single Ladies
Nelly Furtado - Say It Right, Maneater, Im Like A Bird
Ne-Yo - Closer
Shontelle - Impossible
Leona Lewis - Bleeding Love
Lady GaGa - Poker Face, Just Dance, Bad Romance, Telephone
Britney Spears - Gimme More
Ciara - Love Sex Magic
Madonna - 4 Minutes
Justin Timberlake - Cry Me A River
JoJo - Too Little Too Late

thats about all i can think of right now