KT Tunstall.
I just heard her for the first time a couple weeks ago. She's got a great voice, both smooth and soft in some song, but then she can "kick it up a notch" in some songs and it gets that smoky/sexy/raspy tone to it. :-)~~
My favorite song of hers is on her current album "Eye to the Telescope" and the song is "Black Horse & the Cherry Tree" you can hear samples (and see her music videos)
on her website's "Music" page .