So for this project we experimented with panning, when you photograph motion but get the subject in focus and the background blurred. We went on the corner of kraemer and alta vista to take pictures of cars in motion. We also took pictures of still objects and photoshopped them to appear that they were panned images.
To get a clear subject and blurred background you have to follow your objects movement and set your camera to continuous shooting mode and set the aperture to the right setting. For the still photos you just replicate the blur by duplicating the background twice and applying various blur effects on the duplicates and then use gradients to add texture. I think getting the cars in focus was the hardest part of this project.
* http://www.ephotozine.com/article/how-to-create-motion-blur-in-photoshop-13112
Karis' Photo Blog 