As an amateur (as in, gradients + layer styles + occasional brush/abstract design = cool image) Photoshop artist (if you can even call me that) I've found some kick ass tutorials/images by some extremely talented artists.
"The Making of Dawn" by *aiRaGe (tutorial).
*aiRaGe's homepage.
Flame-X's Deviant Art Page.
*aiRaGe's Deviant Art Page.