The importance of Christina Aguilera’s new video, for “Not Myself Tonight,” is not in the new standards it will set for videotaped dance choregraphy or costuming (though we’re loving the bondage feel). Its importance is timing. The mainstream female pop music category has, for months, been dominated by a one Lady Gaga. Christina, a former reigning queen of this genre, took some time off to have a baby and put on a deep red lipstick, but returns with a creative video for what’s really a mid-level song. Bubble dresses and cigarette sunglasses aside, we’re pleased to have another thin blonde re-enter the fray.