Turnerhere.com is an interesting site and business. They have more than 2000 videographers and film-makers on tap around the world to create sponsored short films for them about a variety of topics. These include business profiles, travel destinations, and writers. They have a deal with Simon and Schuster to create short promotional films about their authors and books, and now are expanding this to more publishers.
Naturally there is nothing to prevent you from making such a short film yourself, about you and your writing, to go on your website and your friends' websites and even on your and their MySpace pages, for example. Why not create your own mini-network that way?
You can go to the Turnhere website to see samples of their authors' videos to use as a model. Also, here is a brief interview with the founder of Turnhere, Brad Inman, about how their business works.