Blockbuster Inc. has launched a service that delivers movies to your home via the Internet, as the DVD rental giant looks to expand ways it provides movies to customers. The service is "Blockbuster on Demand" and requires a box made by 2Wire Inc. At least initially, the box is included free if customers rent 25 movies in advance for $99. . . . Blockbuster on Demand is pay as you go, with movies costing between $1.99 and $3.99, Keyes said. You have 30 days to watch the movie, but only 24 hours to finish watching once you start. With Netflix,...