Via Marc Andreesen (yes, the Marc Andreesen), from Variety:
[O]verall music [CD] sales during the Christmas shopping season were down an astounding 21% from last year. From the week of Thanksgiving up through the day before Christmas Eve, 83.9 million albums were sold, a decrease of 21.38 million from 2006's 105.28 million.
It's important to realize, as the RIAA simply can't grasp, this has nothing to do with piracy. Suing people isn't the answer; getting a clue and selling over the Web is.