How do I create fast-moving movies from photos, as in this example?

Hi!

The technique you are referring to is called 'stop motion' you need to use a special program to put together and edit all the single shots you have. Here is a link to a site listing a few of these programs and what they do, perhaps you could find one that suits you. http://www.stopmotionworks.com/stopmosoftwr.htm

I love stop motion animation and uses it a lot, I like the lookk of it much better then video. I made this with Flash:

http://www.louchelust.com/

It isn't free, but it's really great.

When I just started and before I used flash, I did this:

http://www.louchelab.com/Calander.html (check January 30) using a free GIF animation program. Like this: http://www.gif-animator.com/ (there are a lot of those).

Technically it's very easy.

CAMERA:

Set your camera up in a place where it won't move. Then either have a friend click the shutter or else set a timer for the shutter on your camera (usually 10 seconds). Or if you're going to use a built-in computer camera (like an iSight) then just sit right in front of your
 computer and click the shutter yourself.

CREATIVE PLANNING:

One of the aspects of the production that makes that YouTube video look  "fast-moving" is the fact that the lighting changes very distinctly with each image. If every shot was taken with the same lighting, then it would seem more smooth.

VIDEO PRODUCTION:

All you need to do after you've taken all your photos is to string them together into a video. I don't know iWeb very well, but I'm pretty sure you won't be able to do this with that software. You might want to explore some video editing software... I recommend using Quicktime Pro (it's very inexpensive -- $30). With Quicktime Pro you can assemble the images into a sequence and overlay an audio track. Then you can also export the finished video file in a variety of formats and get it up onto YouTube.