Here's a video made using Ripper which captured images every few minutes from a webcam in San Francisco. I like the end where you can see the planes coming in to land.
Ripper is an application that periodically grabs online images to create timelapse movies. Pictures are ripped off a specified website every few seconds, minutes or hours , then they are merged together as frames in a time-lapse video. Some cool effects can be achieved this way.
For more details see this page.