Lauryn Hill and her album, The Miseducation of Lauryn Hill <-- dats my tit

Other then that I'd have to of course say Beyonce, Alicia Keys, and Mariah Carey. I really enjoyed her album the Emancipation of Mimi and a lot of her older stuff (pre-Glitter phase).

Also, don't care for her music but love her voice: Regina Spektor.