Shares of Netflix (Nasdaq: NFLX) have more than doubled over the past six months. Will the company continue its blockbuster performance on Wall Street? How long will DVDs be the dominant format for rentable video? And who will win the video-on-demand-battle -- Apple (Nasdaq: AAPL), Amazon.com (Nasdaq: AMZN), Blockbuster (Nasdaq: BBI), Netflix, or cable companies such as Comcast (Nasdaq: CMCSA)? In this installment of "Fool Video," Motley Fool senior analyst Rick Munarriz gives his take on Netflix and the competition.