Turn a Webcam into a Motion Detecting and Email Notifying Security Cam

If you have an old web cam or two laying around you can convert them into a CCTV system that pushes email and growl notifications to you any time motion is detected in the area they are monitoring.
Sean, a DIYer from the UK, wanted to put his always-on-server to even more use. By linking a webcam to the server and setting up Yawcam (for the motion detection and email notification) on the server and a