You're going down... again. If you thought Descent™ went to the edge of 360° 3D power-blasting sensory insanity, then prepare yourself. You're about to plunge over the edge, and into the depths of Descent II™.
Most popular community and official game content for the past week.  (?)
What does popular mean?
It means the content you're seeing has been rated up more than it has been rated down for the given time period.