How come nobody has mentioned Beyonce or Pink?
Both have great voices, write their own songs, and have the makings of being the next mariah carey [beyonce] and the next madonna [pink]
I agree Britney Spears and Christina Aguilera are great singers, but I don't think that they will stand the test of time as well as they could. As for Justin Timberlake, he may last for a while, but he'll fizzle out in time because he is already getting complacent.
Eminem is pretty cool. He sings what everyone else is thinking, and he is great at coming up with hooks and choruses to keep us interested long enough to pick out the words.
If any of these guys really do become superstars in their own right, I'd be happy with that, cos each of them has given us some pretty cool songs, and i'm sure that what it comes down to has to be the music. At least, I hope so!
Ps, can't see that Kylie was ever a legend or superstar - she's hated in her own country, was a flop in america and only gets on well here cos she shows her backside off at every opportunity. Some of her songs have been good, but she was told what to sing and how to sing it - she's nothing but a puppet on a string!