Sense of motion or speed

There are 3 basic techniques to do this:

1. You can use a fast shutter speed to “freeze” the action. This works only if the action is obvious; for example a ski jumper in mid air.
   
2. With the camera on a tripod, you can use a very slow shutter speed to blur the image of the moving subject while keeping the background in mid air.
   
3. You can use a slow shutter speed and pan the camera to keep the subject sharp while creating streaks in the background.
   

The photo below demonstrates technique #3. I took this picture in front of my house on bright sunny day. A girl bicking on the street.

DSC_0325.JPG,2009/06/18 03:27:57.2
Nikon D60,1/25s - F/36,3872 x 2592
Exposure Mode:Shutter Priority,White Balance:Direct sunlight, 0, 0
Metering Mode:Center-Weighted,Exposure Comp.:0EV
Focal Length:55mm,Focus Mode:AF-C,Sensitivity:ISO 400