Bytesizeoffice.co.uk
offers several good Microsoft Office tutorials. Here are their Excel
2000/XP Tutorials which will show you how to
perform many spreadsheet related tasks and use Excel's functionality
more efficiently. All
Office tutorials on this site are free and take about 10-15 minutes to
complete.
Simple
Excel Calculations 
- Look at Spreadsheet Solutions
- Delete Sheets
- Rename Sheets
- Learn about the order of Preference
- Add Data
- Formulas
- Copy Cell Formatting
- Format Table Design
ECDL Excel Course Modules 1 - 7
- Explore the Workspace
- Getting Familiar with the Workspace
- Using Number Formats
- Re-sizing Rows and Columns
- Using Help Functions
- More on Worksheets
- Apply Formats
- Save your work