Yep! We're using it for our press page[1], it allows us to let our business/marketing people update our press mentions in Google Spreadsheet. We wrote about it here: http://www.cbinsights.com/team-blog/google-spreadsheet-one-p...

[1] http://www.cbinsights.com/press

Tabletop creator here, thanks for mentioning it! It's funny - since my target audience was journalists I never ever ever thought of describing it as "getting JSON from Google Spreadsheets." Looks like it's time to update the ol' README.

Another alternative is the Miso Project http://misoproject.com/dataset/tutorials/googlespreadsheets

I did the same in php and posted about it here, it's the poor man's DB http://sastrestuff.wordpress.com/2013/10/12/poor-mans-sql/