I will agree that most "enhanced" CDs could have done without the "enhancing", but there is one notable exception that I can think of, and that's "Nico" by Blind Melon. That CD is loaded with special features. Articles, interiews, a couple videos, an a lot of other stuff as well. A lot of work was put into it, and it was worth at least the price of admission. The CD didn't cost anything extra, but you got a lot more.
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Matt