Who should use the Google Spreadsheets data API?
The API is designed to help anyone interested in publishing their Google Spreadsheets’ data with other users through mash-ups and developers wishing to integrate their applications with Google Spreadsheets. If you’re a new or casual user of Google Spreadsheets, we suggest you start or continue using Google Spreadsheets through the online editor. To get started, go to http://spreadsheets.google.com/. If you need to develop a more sophisticated application, you might want to consider the Google Spreadsheets data API. This method will allow you to programmatically manage spreadsheets in Google Spreadsheets. Developers should be familiar with the HTTP protocol. You can start here: http://code.google.
