Haha, this thread is great.
I really like Kelly Clarkson as well, especially "Since You've Been Gone" and "Break Away". Great songs!
I tend to like some of Avril Lavigne's stuff, especially the song "I'm With You".
I can't stand the Backstreet Boys, HOWEVER, the song "Incomplete" is really really good, it's a total departure from their usual ultimate crap sound, and if I had written that song for them, I would be extremely proud of it.
I enjoy Josh Groban. The way the reverb responds to his voice sounds really, really good.
I like The Beach Boys, haha.
Also, going down the iTunes list, I dig 311, 30 Seconds to Mars, The Darkness, Fenix TX, Finch, Foo Fighters, Head Automatica, Hoobastank, Muse, Sevendust, SR-71, Stabbing Westward, Staind, Taproot, Thrice, and Underoath.