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Limitations and caveats:
This system would break miserably if it were used in a situation where a rush of users were trying to access the same limited resource because it doesn't put a "lock" on the timeslot until after the form has been submitted.
It also doesn't prevent the user from manually changing the prepopulated form values.
You could end up with a few extra signups for some slots, so I'd advise running your own manual checks if you are using this in mission critical settings.
All that said, it's a free signup tool that integrates into Google Docs.
David Wees wrote the scripts that push columns from spreadsheet to spreadsheet.
Push my thinking
Really Simple Signup System
Problem of practice
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