Redbox Instant, the video-streaming service from Verizon, is launching to the public today. This launch follows a three-month closed beta test, and it comes about a month after the company's announcement that the service would come to the Xbox 360 as a console launch exclusive. To jog your memory, Redbox Instant offers users unlimited access to some 4,000 movies in addition to four DVD rentals at $8 a month. Content partners include heavyw