^ Is that Brittany Brower from ANTM in your avatar?
Ok, I'm no expert. Don't laugh.
Ashlee Simpson
No, she does not suck no matter whatever some events might indicate. Her songs are very catchy and addictive despite sounding noisy ocassionally. I recommend her second album, I Am Me. It's full of good stuff, plus the future single,
Invisible, from the re-released version is just as good.
The Cardigans
This folk/rock thing they have is really awesome too. The vocalist has one of the most interesting voices I have ever heard. It's dreamy and soft and mellow, like a feather cushion. Their songs are really good but not released in the US, except their biggest hit to date,
Lovefool. If you want, I can upload a song or two for you.
Garbage
Yep, they're great. Their last studio album is pure addictive rock music that's catchy enough for the masses. I can recommend a few tracks if you want, but you might have already heard their songs. A few of their singles are pretty mainstream and received airplay. They sang the theme of a 007 movie,
The World Is Not Enough.