iTunes celebrity playlists: the homogenous zone

Breaking news just in: mainstream artists tend to listen to and recommend... other mainstream artists. More and more musicians are utilizing the iTunes Music Store's
celebrity playlist feature as a promotional tool, and despite being able to select from the iTMS's entire catalogue of 1 million tracks, what you tend to hear is exactly what everyone else is listening to.

Disappointing, though not terribly surprising. Some artists do promote lesser-known friends and colleagues, and others resurrect hits from the past. But by and large, they use their DJ stint to make "mix tapes" chock full of what's already on the radio and MTV.

Have you come across any exceptionally good celebrity playlists? Do you find the feature interesting, useful,
annoying...? Do you use the iTMS to publish your own "mix tapes"?