All formats, instructions: Drama Workshop http://chdramaworkshop.homestead.com/ScriptFormats.html

VACT prefers submissions in stage script format: http://chdramaworkship.homestead.com/FormatStagePlay.html

Radio drama script format, sample: CBC Radio Sunday Showcase http://cbc.ca/showcase/sample_script_format.pdf

Script template/formatting freeware: Script Smart http://www.bbc.co.uk/writersroom/scriptsmart/index.shtml