Google Spreadsheet users can now do conditional formatting, which automatically changes the format of a cell based on the cell's contents. Google Spreadsheets also now lets users hide columns and rows.
Standard, Premier, Education and Partner Editions
How to access what's new:
In Google Docs, open a spreadsheet, select a group of cells, and click the icon to change the cell background. Select 'Change with rules...' and add your conditional formatting preferences. To hide a row or column, select a set of rows or columns, right click, and choose 'Hide'.
For more information: