Instrutables user Scavix has put together this great step by step guide on building a networked, HD surveillance camera using the Pi and associated components.
Features include:
- Network access to live video
- Storage & upload of recorded video
- Motion detection & alerting
- Night vision (with the IR camera & lights)
- All weather housing
- More
The housing is up to you but the rest is standard Pi components and the Raspian operating system.
(via Lifehacker)