Easily see all formulas at once in Google Spreadsheets

Now introduced the ability to reveal all formulas with one click

How to access what’s new:
When editing a spreadsheet you can enable this view in three ways: Select the ‘Show All Formulas’ button on the top right; Select ‘Show All Formulas’ in the View menu; Click Ctrl ‘ (Cmd ‘ on a Mac.)

For more information:
http://docs.google.com/support/bin/topic.py?hl=en&topic=15115