Google Spreadsheet to iCal 1.4.2
http://jameslow.com/2008/11/15/google-spreadsheet-to-ical/

Avaliable Sheets:
https://jameslow.com:443/content/software/ical/?sheet=TestSheet
https://jameslow.com:443/content/software/ical/?sheet=MultiEntry
Default Sheet [ALL]:
https://jameslow.com:443/content/software/ical/
All Sheets:
https://jameslow.com:443/content/software/ical/?sheet=[ALL]