Katie's been very popular for a few years, but never appeared on my radar...until now (my fault - I'm sure her earlier stuff is nice, it just never grabbed me - maybe it was a bit slow or too bluesy for me).
This new album, The House, is produced by William Orbit, which implies a lusher sound and perhaps a new direction with more variety.

Well "The Flood" is the first single, and this is seriously entrancing stuff. It shifts midway into an almost-disco feel which might be a bit misplaced, but the beginning and end is full of soaring strings and middle eastern undertones. It's interesting and evocative...
http://www.youtube.com/watch?v=4E4-9yKTv_I
http://www.katiemelua.com
You should also try this - an official medley of 2min samples of 5 tracks from the album.
http://www.youtube.com/watch?v=09WMGgkmowI
I think the closest comparison for me, is Goldfrapp.
Thoughts?
cheers,
Rob.