I find this PDF document published by Adobe to be excellent marketing material. It brings real value to its readers and puts the brand in the background as compared to a traditional product datasheet, but it doesn't forget to sell. Its educational nature makes a good job stating that Adobe is an important player in the digital video market (and desktop-based non-linear editing is a competitive market.) This primer covers the basics yet does is with a voice that doesn't talk down on readers. Exactly how players in prosumer markets are supposed to behave: sell me gear and software that a professional wouldn't laugh at, but please explain it to me.