Joplin.

i'll get hell for this, but the girl from paramore. she's gotta hell of a voice and is hot.

Kim Deal :D

Joan Jett and Suzi Quatro

i thought there already was a thread on this somewhere, oh well. here are my favorites - alissa white gluz (the agonist), brody dalle(the distillers), tarja turunen (nightwish), angela gossow (arch enemy), morgan lander (kittie), dolores o'riordan (the cranberries)

There aren't a lot of bands I like that have females, but I am a huge fan of Sharon den Adel (of the Within Temptation fame), she has such a powerful voice.