For use during the Wiki-Sprint, our online contributor Alex Berry created some very practical Apple Automator / shell-scripts for capturing scheduled screenshots as well as grabbing images from the integrated laptop webcams.

Other people might find them practical for their own projects, so here are the links. The delay between single screenshots can be easily customized, just have a look at the included README files.

Screenshot-auto
http://github.com/axelator/screenshot-auto
Apple Automator workflow that takes screen captures at specified intervals.

Snapme
http://github.com/axelator/Snapme
A compilation of software and scripts used to automatically capture input from a built in iSight camera on MacBook/PRO/AIR computers.