Duffy is one my favorite singer of late. Her voice is really great with broad range and power.
She is also one of the few that would sound better live than in the album.
Here is one of my favorite song of her in live version that I like best.
Now the song is in my phone, lulled me when I am on the road :) I think that if she ever held a concert in Bangkok, I would pay the thousands of baht for the ticket to go see her live.