Check out Susan Marshall. She just got finished touring with Cat Power. She also sang with the Afghan Whigs. Her voice is really amazing. I see her every chance I get when she performs live here. She's working on a new album at the moment and hopefully it will be out soon.
www.susanmarshall.net
Also, check out Planet Swan. She's just moved back to California from Memphis. I'm not sure when her record is out. I haven't heard from her in a while. She has a great rock voice.
www.myspace.com/planet
www.planetswan.com
They both sang on my band's album <a href="http://www.chessclubrocks.com" target=_blank">

</a>! We're pop ... but not female pop.
Doug
Sorry for the edits. I needed to add a little more info.