Imagine trying to sell the first virtual world. Now imagine you're George Lucas trying to sell the first virtual world. It's 1986 and you want people to meet "Habitat".
Fast forward and Machinima is an art form not just a marketing tool. The year is 2010 and the Shanghai Expo includes an exhibit of virtual world machinima. I selected one from an artist I hadn't encountered before (Ketk Petrov) - but go to youtube.com and search on Shanghai Expo Machinima Open This End to see many more.