How can I make a video file smaller so I can e-mail it? I took it on my digital camera.?

How big is it?

If it is under 100 Mb you may be better off using a file storage site. At You Send It dot Com you can store the video and send a URL that will let people download the video.

100 Mb is free for 7 days or 100 downloads.
2 Gb is $9.99 per month with 14 days and 500 downloads.