Well, your description, "It's a new show airing in Nick in 2004" wasn't very descriptive to me, so I searched for it on Google, and this is what I got:
Welcome to the Danny Phantom guide at TV Tome.
From Butch Hartman, the creator of the hit Nicktoon The Fairly OddParents, and the soon to be nicktoon Crash Nebula, Danny Phantom is the animated action/comedy story of 14-year-old Danny Phantom. Danny's an ordinary teenager during the day, but changes into a superhero to battle supernatural forces. Un-Like other super heroes, when Danny changes into a super hero, his Blue eyes and Black hair change to Green and White.
"It's a great comedy/action show that I think you and all the other Nickelodeon animation fans are really going to love. And it's a bit different than anything Nickelodeon has done before." -Butch Hartman
Nickelodeon ordered 13 episodes for the 1st Season of Danny Phantom, for their Spring (april) 2004 block. More info as it comes.
It's show...cliche...normal kids being super heros...it's done in millions of shoes like MLAATR, Power Rangers, etc. So no, I don't exactly think it will be a good show.
-Banana