Yeah, there’s a lot to be desired when it comes to watching movies on mobile, but movie rental powerhouse Blockbuster is testing the waters, with BlackBerry in particular. By using their recently-acquired Movielink digital movie service, Blockbuster CEO James Keyes was able to throw a flick onto a memory card and pop it into his BlackBerry. All of the hassle of sideloading hasn’t gone unnoticed, as he readily admits “The challenge is how do I make this convenient for everybody”. Streaming video support is available in OS 4.3, and combined with a solid 3G connection, renting a movie while on the fly doesn’t seem entirely out of the question. Technical possibility aside, selling the idea to consumers is going to be the tricky part. How many people want to spend more than an hour staring at a two-inch screen?