Common questions we get are from users who want get more out of their excel/ spreadsheet application.
You can tune up on the basics as well as the more complex formatting with the following articles:
http://spreadsheets.about.com/od/excel101/a/Excel_beg_guide.htm
http://www.usd.edu/trio/tut/excel/
http://www.nwnet.org.uk/pages/software_guidance/downloads/ms_applications/excel_tutorial.pdf
http://www.learnthat.com/computers/learn-420-free_microsoft_excel_tutorial.htm
