The Kills have some good stuff as well. Alison Mosshart's voice is just dirty dark at times.
http://www.youtube.com/watch?v=ruc1jTK2H_s
http://www.youtube.com/watch?v=MgaHy7DYs3g
Now, Now or as they were previously known as Now, Now Every Children fronted by Cacie Dalager is one of my favorite little groups that no one knows about. I stumbled across them in the days of myspace. Seen them in Chicago on tour a few times. Pretty good small show with good energy.
http://www.youtube.com/watch?v=sF4fmsWAvr8
http://www.youtube.com/watch?v=eKxTz4kyX40
http://www.youtube.com/watch?v=KA0RqRxp3Lw
As for some more recent stuff. I really dig Metric, Joy Formidable, Santigold.
http://www.youtube.com/watch?v=PZuLsz4yPPM
http://www.youtube.com/watch?v=Y_t4s-HX3z0
http://www.youtube.com/watch?v=SZoHSce004M