The Ken Burns effect is when the camera slowly 'pans' across a picture creating an interesting effect that is more effective than looking at non-moving picture straight on. I found a good way of creating a dramatic skyline pan last week when I was putting together a iMovie to show off the pictures from New York City.
I started with a normal digital picture of the New York skyline.
I then cropped the photograph to eliminate as much ground, people's heads, and sky as possible. This creates a long and 'skinny' picture. I then imported that picture into my iMovie.

Next click on the crop icon inthe upper right hand corner of the picture.
There will be a greensquare and red square. The green square represents the beginning of the Ken Burns effect and the red square represents the ending of the Ken Burns effect. Until last week I always thought that the two squares needed to overlap to work, but I was wrong. Take the green square and push it the left hand side of the picture and push the red square to the right hand side of the picture. This will create a pan the will go from the far left of the picture to the far right hand side of the picture. Make sure to click on the time icon and increase the time that the slide is shown on the screen. (I used 9.6 seconds) The more time that you give the slide, the slower and more dramatic the effect will be. I'll post an example. Give it a try and let me know what you think.