LB, I don't know the chords, but wanted to thank you for the link. Huge Sophie fan here I have both her CDs and her singles off the 30 day project on my ipOd and enjoy them. Although I sub to her channel, I never saw that video before.
I ran it through Capo, and it looks like it's in the key of E, with the intro being B (V) and E (I) over and over. Then throwing some A(IV) in there, and then a C#m (iv) followed by an F#m (ii).
I wouldn't have done it except that I've been curious about this song for a while. In D tuning you would play the chord formations the way you would the key of D in C tuning. Make sense?
I've been meaning to experiment with D tuning as I'm working through some basic Roy Smeck pieces, so maybe this is a chance to do that.