Useful formulas and resources for becoming a spreadsheets master
http://woork.blogspot.com/2009/03/useful-formulas-and-resources-for.html
10 Useful Google Spreadsheet Formulas You Must Know – woorkup.com
http://woorkup.com/2010/02/19/10-useful-google-spreadsheet-formulas-you-must-know/

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Google Spreadsheet is a powerful and free tool to manage complex spreadsheets. This tutorial illustrates ten useful formulas you must know to help you simplify the way you work in Google Spreadsheet.