Here are seveal good Excel tutorial and tip sites that will help you learn Pivot Tables for Excel versions 2003 and 2000, and the new and legacy functionality for Pivot Tables with these two versions of Excel.
27 Pivot Table Tips:
http://www.exceltip.com/excel_tips/Excel_Pivot_Tables/32.html
Pivot Tables Tutorials:
http://www.techonthenet.com/excel/pivottbls/index.php
Pivot Tables Tips:
http://exceltips.vitalnews.com/E054_PivotTables.html
Free Excel Training handouts, including Pivot Tables for Excel 2000:
http://www.davis.k12.ut.us/district/etc/paul/excel.html
3 Free Excel 2003 Pivot Training Courses:
PivotTable I: What's so great about PivotTable reports?
http://office.microsoft.com/training/training.aspx?AssetID=RC010136191033
Length: 30 min
PivotTable II: Swing into action with PivotTable reports
http://office.microsoft.com/training/training.aspx?AssetID=RC010286901033
Length: 40 min
PivotTable III: Show off your PivotTable skills
http://office.microsoft.com/training/training.aspx?AssetID=RC010381561033
Length: 50 min