Here is a link to the IDPA rulebook for those interested in shooting but don't know the equipment requirements or procedures.
*EDIT*
The rulebook is now only available as a PDF
http://www.idpa.com/Documents/IDPARuleBook2005.pdf
*EDIT*
The rulebook is now only available as a PDF
http://www.idpa.com/Documents/IDPARuleBook2005.pdf