What is HSSVSS?
HSSVSS is a high quality motion detecting surveillance system and its free!

HSSVSS Features
--Full Screen Video from your digital USB camera
--Creates Time Stamped Images
--Motion Detection triggers image capture
--Time-Lapsed Photography mode triggers image capture
--Time and Date stamps images
--Creates Motion and Time-lapsed AVI movies.
--Twin Cam mode allows for two cameras.
--Email reports
--Export images to your website with FTP
--USB compatible
--Excellent Target Zone Range
--Very easy to use

HSVSS has many more features, which are not listed here. 
 
http://www.hssvss.com/