Through-the-mail movie rental outfit Netflix has been very aggressive in fighting Blockbuster's competitive advances — and winning. Analytics firm Compete has a rundown of Netflix vs. Blockbuster and lists Netflix.com as having four times the visitors Blockbuster.com does. Also, Netflix's download strategy seems to be having some success with 450,000 "Watch Instantly" users in November. Blockbuster is still attempting to roll out a download service it gained from its purchase of movie download site Movielink. Good luck to both of them. Apple is rumored to be introducting movie rentals to iTunes. Will they be battle-tested veterans by the time Steve Jobs shows up — or so bloodied from fighting each other they'll fall victim to his shiny white-plastic machine?