Excel 2007 Office Button
The Office Button replaces the File menu from previous versions of Excel. Common tools such as printing and saving are performed from here.
Recent documents can be seen on the right of the Office Button menu. This will speed up opening the spreadsheet that you often use. It is possible to pin documents that you use often to this menu by clicking the pin icon to the right of the document.
Click the pin again to unpin the workbook. Now that is cool!