Well, you seem to like Aly & AJ, so you'd probably settle for any female-fronted pop-Rock, right? Then go ahead and listen to some Nightwish and at least gain the illusion of being cultured. Second thought, bad idea. Don't listen to Nightwish. Nor should you listen to anyone who suggests them. Tarja sucked as a vocalist and their new material with what's-her-face just sucks in general.
Go listen to Girlschool. They were awesome. So are the Muffs. Sneaker Pimps were also awesome back in the day. Qntal, for the weird folky/orchestral/electronic stuff. If you like cellos, Rasputina is a good choice. Stolen Babies has a female vocalist, but they're a bit... out there. And of course, Trance Of Mine is awesome. But no one's ever heard of them. Don't know why... they sound like Lacuna Coil if LC ever had talent. There's the classic Ace of Base. Gabby La La is sort of like a cross between an elf and Björk, who I guess could also be mentioned if you don't mind her monotonous instrumentals and overly shrill voice. The B-52s sort of split vocal duties between male and female, but their main hit "Roam" was strictly females IIRC.
And that's all I can think of off the top of my head.
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