CalendarCreator.dmg is a service for Mac OS X.
Install by double clicking the disk image (the .dmg file you download) and dragging the CalendarCreator.service file on the newly mounted drive to ~/Library/Services/ or /Library/Services/. Once you log out and log back in you will be able to add any selected text as an event in iCal in a new calendar called 'CalendarCreator.' You can read the ReadMe if you really want to to find out just how it all works and for further help installing the service.
Mac OS X 10.2, 10.3 and 10.4.