iSpy is an application that uses your computers' webcams and microphones to detect movement or sound for security purposes.

It can run on multiple computers simultaneously. Captured media is compressed to flash video or mp4 and streamed securely over the web and local network. It even supports e-mail, SMS and MMS for purposes of sending alerts upon detections (subscription may be required for some alert functions).

This impressive software is one of the most feature rich commercially available solutions for home or office security. It is definitely worth checking out.