You’ve watched The Social Network by now — right? It’s a great movie. If you haven’t seen it, go and see it! It’s about facebook and evil twins and greed — and about the contemporary obsession with obsession.
Anyway, in that film, there’s a great scene featuring tilt-shift. When I first saw it I gasped and knew that that effect was my favorite. So if you want to learn some introductory tips about achieving the perfect tilt-shift, check this video out. It’s short and to the point, and in no way comprehensive, but you can learn more on their website.