Like Mika last year, Duffy became my fave new artist on first hearing. I'm a bit late to post "Mercy", though still not tired of hearing it.
Here are a few other choice tracks. Duffy's voice eminds me a bit of an 80s singer called Carmel, whose biggest hit was "Bad Day".
The video for the title song from the current album, "Rockferry"
"Warwick Avenue", allegedly the next single, performed on "Later' last year
Lastly, a couple of covers from the 2007 into 2008 Hootenanny show.