iSentry 2.5

Use iSentry to instantly turn your computer with Web camera into a Internet-connected motion-sensing security system.

Just launch iSentry, point your camera to the region you want to monitor, and prepare to receive a video or photo should any motion activity is detected.
With a wide selection of settings, iSentry allows you to schedule the activation time, enable sound alerts, and receive email notifications about the events detected. In addition to storing the pictures and video clips it takes on disk or in an iPhoto album, iSentry can upload them to a free image hosting site like ImageShack.